Gastrodon (Pokémon)

For Pokémon GO information on this species, see the game's section.
← #0422: Shellos	Pokémon	#0424: Ambipom →
This article is about the species. For a specific instance of this species, see Gastrodon (disambiguation).

Gastrodon Sea Slug Pokémon トリトドン Tritodon #0423 Images on the Bulbagarden Archives
Type Water Ground Unknown Unknown Unknown Unknown Unknown Unknown Unknown Unknown Unknown Unknown
Abilities Sticky Hold or Storm Drain Cacophony Cacophony Sand Force Hidden Ability Cacophony Hidden Ability Cacophony Cacophony
Gender ratio Unknown 50% male, 50% female	Catch rate 75 (17.5%)
Breeding Egg Groups Water 1 and Amorphous Hatch time 20 cycles
Height 2'11" 0.9 m Gastrodon 0'0" 0 m {{{form2}}} 0'0" 0 m {{{form3}}} 0'0" 0 m {{{form4}}}	Weight 65.9 lbs. 29.9 kg Gastrodon 0 lbs. 0 kg {{{form2}}} 0 lbs. 0 kg {{{form3}}} 0 lbs. 0 kg {{{form4}}}
Mega Stone [[|]] [[|]]
Base experience yield 176 Gen. IV Unknown IV 166 V+	Leveling rate Medium Fast
EV yield Total: 2 Gastrodon 2 HP 0 Atk 0 Def 0 Sp.Atk 0 Sp.Def 0 Speed 0 HP 0 Atk 0 Def 0 Sp.Atk 0 Sp.Def 0 Speed 0 HP 0 Atk 0 Def 0 Sp.Atk 0 Sp.Def 0 Speed 0 HP 0 Atk 0 Def 0 Sp.Atk 0 Sp.Def 0 Speed
Shape	Footprint {{{form2}}}
Pokédex color   Purple Other forms may have other colors.	Base friendship 70
External Links On Smogon Pokédex: Generation IV Generation V Generation VI Generation VII Generation VIII Generation IX Artwork on Bulbagarden Archives

Gastrodon (Japanese: トリトドン Tritodon) is a dual-type Water/Ground Pokémon introduced in Generation IV.

It evolves from Shellos starting at level 30.

Gastrodon has two different forms: West Sea Gastrodon, which is pink and brown in appearance, and East Sea Gastrodon, which is blue and green. They are found on the respective sides of Sinnoh's mountain range.

Biology

Gastrodon is a sea slug-like Pokémon. Much like its pre-evolved form, it has a slug-like body with a round head and a mantle covering the top half of its body. It has six stubby legs and two black eyes with white pupils, with a mark imitating a third eye appearing on its forehead. A yellow stripe runs along the edge of its mantle, through its two lower eyes, and around the back of its head. Like Shellos, Gastrodon has two forms based on the sea it lives in.

In its West Sea form, it has a pair of large tentacles on its head that curve upward and a smaller, straighter pair on its neck. Its underside is pink, while its mantle is brown, with three pink spots on each side of its back. There are also two lumps on its back, resembling the cerata on real-life sea slugs.

In its East Sea form, it retains the head tentacles it had as a Shellos, which are now fully green and angled slightly further upward. Its underside is turquoise, while its mantle is forest green with two turquoise spots on each side. It has a pair of yellow, fin-like cerata on its back and a wavy yellow line bordering its side and rear.

Gastrodon and its pre-Evolution Shellos are examples of allopatric speciation, although the two forms can still breed with each other. It is also a relative of Shellder and Cloyster. When threatened, it oozes a purple liquid and flees. While not poisonous, the fluid is very bitter and sticky. Its mucus-coated body is soft and squishy yet surprisingly resilient, and it leaves behind a trail of sticky slime when moving on land. It also has strong regenerative capabilities that allow it to recover from injuries or dismemberment within a few hours. In ancient times, it had a shell on its back, which gradually became a thin yet hard vestigial plate.

Gastrodon lives in shallow tidal pools, beaches, and rocky shorelines. Its diet consists mainly of plankton, but it is occasionally known to move onto land to look for other foods, such as beach sand. When it finds prey, it melts it with mucus before eating them. While Gastrodon cannot stay out of water for too long due to its body being highly vulnerable to dehydration, it becomes more active during cloudy or rainy weather. It has been found on far-off mountains during times of constant rain. The two forms of Gastrodon are known to engage in heated conflict with one another. West Sea Gastrodon was much more numerous in the past than it is in the present. Conversely, East Sea Gastrodon's population has visibly increased in population as of late.

Forms

Gastrodon has two separate forms: West Sea Gastrodon and East Sea Gastrodon. The two forms are purely cosmetic, and do not affect base stats or level-up moves.

West Sea

East Sea

Evolution

Gastrodon evolves from Shellos.

West Sea

Unevolved Shellos West Sea  Water

→

First Evolution Gastrodon West Sea  Water  Ground

East Sea

Unevolved Shellos East Sea  Water

→

First Evolution Gastrodon East Sea  Water  Ground

Game data

Pokédex entries

This Pokémon was unavailable prior to Generation IV.
Generation IV Sinnoh #061 Johto #— Diamond It has a pliable body without any bones. If any part of its body is torn off, it grows right back. Pearl It apparently had a huge shell for protection in ancient times. It lives in shallow tidal pools. Platinum Long ago, its entire back was shielded with a sturdy shell. There are traces of it left in its cells. HeartGold When its natural enemy attacks, it oozes purple fluid and escapes. SoulSilver
Generation V Unova #— Black Long ago, its entire back was shielded with a sturdy shell. There are traces of it left in its cells. White Black 2 Long ago, its entire back was shielded with a sturdy shell. There are traces of it left in its cells. White 2
Generation VI Kalos #— Hoenn #— X When its natural enemy attacks, it oozes purple fluid and escapes. Y It apparently had a huge shell for protection in ancient times. It lives in shallow tidal pools. Omega Ruby When its natural enemy attacks, it oozes purple fluid and escapes. Alpha Sapphire It apparently had a huge shell for protection in ancient times. It lives in shallow tidal pools.
Generation VII Alola  S  M : #261 Alola  US  UM : #342 Kanto #— This Pokémon has no Pokédex entries in Let's Go, Pikachu! and Let's Go, Eevee!. West Sea Sun It has strong regenerative capabilities. Even if parts of it are bitten off by fish Pokémon, it will return to normal within a few hours. Moon Plankton, invisible to the naked eye, is its main food source. It comes onto the land periodically, but the reason for this is not known. Ultra Sun Long ago, it had a shell on its back. There's now a vestigial plate on its back that's hard but thin. Ultra Moon Their shape and color change, depending on their environment and diet. There are many of them at beaches where the waves are calm. East Sea Sun A team of researchers is scouring the oceans of the world in search of a Gastrodon in a color never seen before. Moon Experiments are being conducted to discover what happens when a Gastrodon is raised in a location other than the sea where it was born. Ultra Sun When it's attacked, it gushes a purple liquid that's not poisonous but makes Gastrodon's meat bitter and inedible. Ultra Moon A relative of Shellder and Cloyster, this ocean dweller sometimes comes onto land in search of food.
Generation VIII Galar #231 Sinnoh #061 Hisui #083 Brilliant Diamond It has a pliable body without any bones. If any part of its body is torn off, it grows right back. Shining Pearl It apparently had a huge shell for protection in ancient times. It lives in shallow tidal pools. West Sea Sword Its search for food sometimes leads it onto land, where it leaves behind a sticky trail of slime as it passes through. Shield The softness of its body helps disperse the force of impacts, so although its body is uncommonly squishy, it's also surprisingly resilient. Legends: Arceus Eats beach sand for nourishment. Should one Gastrodon encounter another of a different color, a fierce battle will inevitably ensue. East Sea Sword It secretes a purple fluid to deter enemies. This fluid isn't poisonous—instead, it's super sticky, and once it sticks, it's very hard to unstick. Shield Its body is covered in a sticky slime. It's very susceptible to dehydration, so it can't spend too much time on land. Legends: Arceus Found more often on the land than in the sea. More active when it's cloudy or rainy out than when the weather is fair.
Generation IX Paldea #328 Kitakami #— Blueberry #— West Sea Scarlet Its whole body is sticky with mucus. In the past, this form of Gastrodon was by far the more numerous one. Violet It appears on beaches where the waters are shallow. Once it catches prey, it will slowly melt them with its mucus before slurping them up. East Sea Scarlet They normally inhabit rocky seashores, but in times of continuous rain, they can sometimes be found in the mountains, far from the sea. Violet Fishers say that they didn't see many of these Pokémon in the past, but this form of Gastrodon is now increasing in number.

West Sea Gastrodon in the Alola Pokédex	East Sea Gastrodon in the Alola Pokédex	East Sea Gastrodon in the Paldea Pokédex

Game locations

This Pokémon was unavailable prior to Generation IV.
Generation IV Diamond Pearl Routes 218 and 221, Fuego Ironworks (tall grass) (West Sea) Routes 222, 224, and 230 (tall grass) (East Sea) Platinum Route 218, Fuego Ironworks (tall grass) (West Sea) Routes 205 and 218, Canalave City, Valley Windworks, Fuego Ironworks (Surfing) (West Sea) Routes 212, 213, and 224, Pastoria City (Surfing) (East Sea) HeartGold SoulSilver Evolve Pokéwalker Shellos (West Sea) Trade (East Sea)
Generation V Black White Trade Black 2 White 2 Evolve Shellos
Generation VI X Y Friend Safari (Ground) (West Sea) Omega Ruby Evolve Shellos (West Sea) Alpha Sapphire Evolve Shellos (East Sea)
Generation VII Sun Moon Ancient Poni Path, Exeggutor Island, Poni Wilds (East Sea) Trade (West Sea) Ultra Sun Ultra Moon Ancient Poni Path, Exeggutor Island, Poni Wilds (East Sea) Poni Breaker Coast (Surfing) (East Sea) Evolve Shellos (West Sea) Let's Go Pikachu Let's Go Eevee Unobtainable
Generation VIII Sword Shield Pokémon HOME (West Sea) Route 9, Galar Mine No. 2, Dusty Bowl, Giant's Mirror (East Sea) Bridge Field, Dusty Bowl, Giant's Cap, Giant's Mirror, Lake of Outrage, Rolling Fields, South Lake Miloch, West Lake Axewell (Max Raid Battle) (East Sea) Expansion Pass Max Lair (Dynamax Adventure) (East Sea) Brilliant Diamond Shining Pearl Routes 218 and 221, Fuego Ironworks (tall grass) (West Sea) Routes 222, 224, and 230 (tall grass) (East Sea) Grand Underground - Fountainspring Cave Legends: Arceus Obsidian Fieldlands: Ramanas Island, Sandgem Flats, massive mass outbreaks (West Sea) Cobalt Coastlands: Seagrass Haven (additional ), massive mass outbreaks (East Sea)
Generation IX Scarlet Violet North Province: Area One, Area Three (East Sea) North Province: Casseroya Lake (West Sea) Tera Raid Battles (4★) (WestV/EastS Sea)

In side games

This Pokémon was unavailable prior to Generation IV.
Generation IV MD Time MD Darkness Brine Cave (B1F-B9F, Lower Brine Cave B1F) (West Sea) Craggy Coast (B1F-B9F) (East Sea) MD Sky Brine Cave (B1F-B9F, Lower Brine Cave B1F) (West Sea) Craggy Coast (B1F-B9F) (East Sea) Ranger: SoA Marine Cave, Volcano Cave Rumble Bright Beach Ranger: GS Faldera Island
Generation V Rumble Blast Desert: Rugged Flats (West Sea) Beach: Sunny Seashore (East Sea) Rumble U Secret Warehouse: The Enemies Within (West/East Sea)
Generation VI Battle Trozei Safari Jungle: Stage 3Sa Island of Haste: Stage 4 Rumble World Origin Hideaway: Secret Cove (All Areas), Distortion Land: Vast Ocean (All Areas) (West/East Sea)
Generation VII Rumble Rush Garchomp Sea, Arceus Sea, Garchomp SeaFinal (West/East Sea)
Generation VIII This Pokémon is unavailable in Generation VIII side games.
Cross-Generation Shuffle Violeta Palace: Stage 389 (West Sea) Prasino Woods: Stage 559 (East Sea) Masters EX Trainer Lodge Friendship Level 100: Cynthia & Gastrodon (West Sea)

In events

West Sea Gastrodon

Games	Event	Language/Region	Location	Level	Distribution period
SMUSUM	Paul Ruiz's West Sea Gastrodon	All	United States	50	June 21 to 23, 2019

East Sea Gastrodon

Games	Event	Language/Region	Location	Level	Distribution period
SwSh	Hirofumi Kimura's East Sea Gastrodon	All	online	50	August 22 to 23, 2020
SwSh	Eric Rios's East Sea Gastrodon	All	online	50	June 24 to 27, 2022
SV	Wonseok Jung's East Sea Gastrodon	All	online	50	June 17 to 18, 2023
SV	Eduardo Cunha's East Sea Gastrodon	All	online	50	August 10 to 14, 2023

Held Items

Games		Held items
Legends: Arceus		Normal Nanab Berry (30%) Ball of Mud (15%) Grit items by level Alpha Exp. Candy M (100%) Seed of Mastery (20%) Grit items by level

Stats

Base stats

Stat		Range
		At Lv. 50	At Lv. 100
HP: 111		171 - 218	332 - 426
Attack: 83		79 - 148	153 - 291
Defense: 68		65 - 132	126 - 258
Sp. Atk: 92		87 - 158	170 - 311
Sp. Def: 82		78 - 147	152 - 289
Speed: 39		39 - 100	74 - 194
Total: 475	Other Pokémon with this total
Minimum stats are calculated with 0 EVs, IVs of 0, and (if applicable) a hindering nature. Maximum stats are calculated with 252 EVs, IVs of 31, and (if applicable) a helpful nature.

Pokéathlon stats

Speed 1/2 ★☆	Power 4/5 ★★★★☆
Skill 3/3 ★★★	Stamina 5/5 ★★★★★
Jump 2/2 ★★	Total 15/17 ★★★

Type effectiveness

Under normal battle conditions in Generation IX, this Pokémon is:

Damaged normally by: Normal 1× Fighting 1× Flying 1× Poison ½× Ground 1× Rock ½× Bug 1× Ghost 1× Steel ½× Fire ½× Water 1× Grass 4× Electric 0× Psychic 1× Ice 1× Dragon 1× Dark 1× Fairy 1× None

Weak to: Normal 1× Fighting 1× Flying 1× Poison ½× Ground 1× Rock ½× Bug 1× Ghost 1× Steel ½× Fire ½× Water 1× Grass 4× Electric 0× Psychic 1× Ice 1× Dragon 1× Dark 1× Fairy 1× None

Immune to: Normal 1× Fighting 1× Flying 1× Poison ½× Ground 1× Rock ½× Bug 1× Ghost 1× Steel ½× Fire ½× Water 1× Grass 4× Electric 0× Psychic 1× Ice 1× Dragon 1× Dark 1× Fairy 1× None

Resistant to: Normal 1× Fighting 1× Flying 1× Poison ½× Ground 1× Rock ½× Bug 1× Ghost 1× Steel ½× Fire ½× Water 1× Grass 4× Electric 0× Psychic 1× Ice 1× Dragon 1× Dark 1× Fairy 1× None

Notes: If this Pokémon is given a Ring Target, the effectiveness of  Electric-type  moves is 2×. If this Pokémon has Storm Drain, the effectiveness of  Water-type  moves is 0×.

Learnset

By leveling up

Generation IX Other generations: IV - V - VI - VII - VIII

Level   Move   Type   Cat.   Pwr.   Acc.   PP 011 Water Gun Water Special 04040 100100% 25 011 Mud-Slap Ground Special 02020 100100% 10 011 Harden Normal Status 0000— 00——% 30 011 Recover Normal Status 0000— 00——% 5 1515 Water Pulse Water Special 06060 100100% 20 2020 Ancient Power Rock Special 06060 100100% 5 2525 Body Slam Normal Physical 08585 100100% 15 3333 Muddy Water Water Special 09090 08585% 10 3939 Earth Power Ground Special 09090 100100% 10 4646 Rain Dance Water Status 0000— 00——% 5 5353 Memento Dark Status 0000— 100100% 10

Bold indicates a move that gets STAB when used by Gastrodon Italic indicates a move that gets STAB only when used by an Evolution of Gastrodon Click on the generation numbers at the top to see level-up moves from other generations

By TM

Generation IX Other generations: IV - V - VI - VII - VIII

TM   Move   Type   Cat.   Pwr.   Acc.   PP  TM001 TM001 Take Down Normal Physical 09090 085}}85% 20 TM005 TM005 Mud-Slap Ground Special 02020 100}}100% 10 TM007 TM007 Protect Normal Status 0000— 00—}}—% 10 TM011 TM011 Water Pulse Water Special 06060 100}}100% 20 TM022 TM022 Chilling Water Water Special 05050 100}}100% 20 TM025 TM025 Facade Normal Physical 07070 100}}100% 20 TM028 TM028 Bulldoze Ground Physical 06060 100}}100% 20 TM034 TM034 Icy Wind Ice Special 05555 095}}95% 15 TM035 TM035 Mud Shot Ground Special 05555 095}}95% 15 TM036 TM036 Rock Tomb Rock Physical 06060 095}}95% 15 TM047 TM047 Endure Normal Status 0000— 00—}}—% 10 TM050 TM050 Rain Dance Water Status 0000— 00—}}—% 5 TM051 TM051 Sandstorm Rock Status 0000— 00—}}—% 10 TM052 TM052 Snowscape Ice Status 0000— 00—}}—% 10 TM055 TM055 Dig Ground Physical 08080 100}}100% 10 TM066 TM066 Body Slam Normal Physical 08585 100}}100% 15 TM070 TM070 Sleep Talk Normal Status 0000— 00—}}—% 10 TM076 TM076 Rock Blast Rock Physical 02525 090}}90% 10 TM077 TM077 Waterfall Water Physical 08080 100}}100% 15 TM084 TM084 Stomping Tantrum Ground Physical 07575 100}}100% 10 TM085 TM085 Rest Psychic Status 0000— 00—}}—% 5 TM086 TM086 Rock Slide Rock Physical 07575 090}}90% 10 TM090 TM090 Spikes Ground Status 0000— 00—}}—% 20 TM103 TM103 Substitute Normal Status 0000— 00—}}—% 10 TM110 TM110 Liquidation Water Physical 08585 100}}100% 10 TM116 TM116 Stealth Rock Rock Status 0000— 00—}}—% 20 TM123 TM123 Surf Water Special 09090 100}}100% 15 TM128 TM128 Amnesia Psychic Status 0000— 00—}}—% 20 TM130 TM130 Helping Hand Normal Status 0000— 00—}}—% 20 TM133 TM133 Earth Power Ground Special 09090 100}}100% 10 TM135 TM135 Ice Beam Ice Special 09090 100}}100% 10 TM142 TM142 Hydro Pump Water Special 110110 080}}80% 5 TM143 TM143 Blizzard Ice Special 110110 070}}70% 5 TM148 TM148 Sludge Bomb Poison Special 09090 100}}100% 10 TM149 TM149 Earthquake Ground Physical 100100 100}}100% 10 TM150 TM150 Stone Edge Rock Physical 100100 080}}80% 5 TM152 TM152 Giga Impact Normal Physical 150150 090}}90% 5 TM163 TM163 Hyper Beam Normal Special 150150 090}}90% 5 TM171 TM171 Tera Blast Normal Special 08080 100}}100% 10 TM176 TM176 Sand Tomb Ground Physical 03535 085}}85% 15 TM193 TM193 Weather Ball Normal Special 05050 100}}100% 10 TM202 TM202 Pain Split Normal Status 0000— 00—}}—% 20 TM208 TM208 Whirlpool Water Special 03535 085}}85% 15 TM209 TM209 Muddy Water Water Special 09090 085}}85% 10 TM214 TM214 Sludge Wave Poison Special 09595 100}}100% 10 TM219 TM219 Skitter Smack Bug Physical 07070 090}}90% 10 TM224 TM224 Curse Ghost Status 0000— 00—}}—% 10

Bold indicates a move that gets STAB when used by Gastrodon Italic indicates a move that gets STAB only when used by an Evolution or an alternate form of Gastrodon Click on the generation numbers at the top to see TM moves from other generations

By breeding

Generation IX Other generations: IV - V - VI - VII - VIII

Parent   Move   Type   Cat.   Pwr.   Acc.   PP  Acid Armor Poison Status — —% 20 Clear Smog Poison Special 50 —% 15 Counter Fighting Physical — 100% 20 Curse Ghost Status — —% 10 Mirror Coat Psychic Special — 100% 20 Mist Ice Status — —% 30 Sludge Poison Special 65 100% 20 Spit Up Normal Special — 100% 10 Stockpile Normal Status — —% 20 Swallow Normal Status — —% 10 Yawn Normal Status — —% 10

Moves marked with an asterisk (*) must be chain bred onto Gastrodon Bold indicates a move that gets STAB when used by Gastrodon Italic indicates a move that gets STAB only when used by an Evolution of Gastrodon Click on the generation numbers at the top to see Egg moves from other generations

By a prior Evolution

Generation IX Other generations: IV - V - VI - VII - VIII

Stage   Move   Type   Cat.   Pwr.   Acc.   PP  This Pokémon has no moves exclusive to prior Evolutions.

Bold indicates a move that gets STAB when used by Gastrodon Italic indicates a move that gets STAB only when used by an Evolution of Gastrodon Click on the generation numbers at the top to see moves from other generations

Side game data

West Sea

Pokémon Mystery Dungeon Explorers of Time, Explorers of Darkness, and Explorers of Sky Body size: 1 Recruit rate: 8.2% IQ group: E
Pokémon Super Mystery Dungeon Body size: Standard (1 tile) How to Recruit: Visit Gastrodon's secret base Connected to: Slowking, East Sea Shellos, East Sea Gastrodon Connection Orb Set: 3 Phrases Normal I used to run a business appraising Treasure Boxes with my husband! ♪ Low HP (< 50%) *pant pant* Protect me, honey!
Pokémon Ranger: Shadows of Almia Group: Water Poké Assist: Water Field move: (Soak ×2) Browser entry R-038 It spits orbs of water and hunks of dirt to attack.
Pokémon Ranger: Guardian Signs Group: Water Poké Assist: (present) Water Field move: (present) (Soak ×3) Not available in the past. Browser entry R-087 It attacks by spitting bubbles that make Pokémon Slowed.
Pokémon Rumble Attack ●●● Defense ●●● Speed ●●●			Pokémon Rumble Blast Attack ●●● Defense ●●● Speed ●●●
Pokémon Rumble Rush Walking Speed: 2.33 seconds Base HP: 61 Base Attack: 78 Base Defense: 54 Base Speed: 60
Pokémon Battle Trozei Water Attack Power: ★★★★★			Pokémon Shuffle Water Attack Power: 60 - 105 5 #529 Power of 5 Increases damage when you make a match of five.
Pokémon GO Base HP: 244 Base Attack: 169 Base Defense: 143 Egg Distance: N/A Buddy Distance: 3 km Evolution Requirement: N/A Fast Attacks: Mud-Slap, Hidden Power Charged Attacks: Water Pulse, Earth Power*, Body Slam, Earthquake×

East Sea

Pokémon Mystery Dungeon Explorers of Time, Explorers of Darkness, and Explorers of Sky Body size: 1 Recruit rate: 8.2% IQ group: E
Pokémon Super Mystery Dungeon Body size: Standard (1 tile) How to Recruit: Visit Gastrodon's secret base Connected to: Feraligatr, West Sea Shellos, East Sea Shellos, West Sea Gastrodon Connection Orb Set: 3 Phrases Normal My wife has a squishy body. I do, too. Low HP (< 50%) Where's…my wife?
Pokémon Rumble Attack ●●● Defense ●●● Speed ●●●			Pokémon Rumble Blast Attack ●●● Defense ●●● Speed ●●●
Pokémon Rumble Rush Walking Speed: 2.33 seconds Base HP: 61 Base Attack: 78 Base Defense: 54 Base Speed: 60
Pokémon Battle Trozei Water Attack Power: ★★★★★			Pokémon Shuffle Ground Attack Power: 60 - 105 5 #529 Swap+ Sometimes replaces three disruptions with this Pokémon.
Pokémon GO Base HP: 244 Base Attack: 169 Base Defense: 143 Egg Distance: N/A Buddy Distance: 3 km Evolution Requirement: N/A Fast Attacks: Mud-Slap, Hidden Power Charged Attacks: Water Pulse, Earth Power*, Body Slam, Earthquake×

Form data

Gastrodon has two different forms: West Sea Gastrodon and East Sea Gastrodon. In most cases, where it is encountered in the wild determines its form. This is purely a cosmetic difference, and this Pokémon cannot change between forms.

West Sea Gastrodon is pink and brown in color, whereas East Sea Gastrodon is blue and green. There is also a slight difference in shape depending on the form.

In Sinnoh and Hisui, West Sea Gastrodon is encountered west of Mount Coronet, while East Sea Gastrodon is encountered east of Mount Coronet. In Paldea, West Sea Gastrodon is encountered in Casseroya Lake, while East Sea Gastrodon is encountered in North Province (Area One); both forms can also be found in Tera Raid Battles regardless of location. In other regions, only one form appears in the wild per game (with the other only obtainable via trading or transfer): Gastrodon only appears in its West Sea form in Kalos's Friend Safari, and in Alola and Galar, only East Sea Gastrodon appear in the wild.

Evolution data

West Sea

Unevolved Shellos West Sea  Water

Level 30 →

First Evolution Gastrodon West Sea  Water  Ground

East Sea

Unevolved Shellos East Sea  Water

Level 30 →

First Evolution Gastrodon East Sea  Water  Ground

Sprites

This Pokémon was unavailable prior to Generation IV.
Generation IV Diamond Pearl Platinum HeartGold SoulSilver Front Back Front Back Front Back
Generation V Black White Black 2 White 2 Front Back Front Back
Generation VI X Y Omega Ruby Alpha Sapphire Front Back Front Back
Generation VII Sun Moon Ultra Sun Ultra Moon Front Back Front Back
Generation VIII Sword Shield Legends: Arceus
Cross-Generation HOME

For other sprites and images, please see Gastrodon images on the Bulbagarden Archives.

In animation

West Sea Gastrodon in Pokémon the Series: Diamond and Pearl

East Sea Gastrodon in Pokémon the Series: Diamond and Pearl

Major appearances

Zoey's Gastrodon

In Last Call — First Round!, Zoey's West Sea Shellos was revealed to have evolved into a Gastrodon. It was used alongside Lumineon in the Performance Stage of the Sinnoh Grand Festival. Gastrodon was later used in the Contest Battles as well, winning them and assuring Zoey would make her way to the finals.

Other

West Sea Gastrodon debuted in Double Team Turnover!, under the ownership of Cynthia. In Aiding the Enemy, it battled Aaron's Beautifly on television. It was able to defeat Beautifly in addition to Aaron's Drapion, giving Cynthia the win. It reappeared in Pride of a Champion!, The Fiery Road to Mastership!, and Bewitch, Battle, and Bewilder! when Cynthia used it in her Masters Eight Tournament matches against Iris and Ash.

East Sea Gastrodon debuted in Familiarity Breeds Strategy!, under the ownership of Paul. It battled Ash's Staraptor and Buizel in their Lily of the Valley Conference match, losing against the latter.

Minor appearances

In Old Rivals, New Tricks!, a Coordinator's West Sea Gastrodon competed in the Sandalstraw Contest.

Two Gastrodon, one East Sea and one West Sea, appeared in Chasing Memories, Creating Dreams!, under the ownership of different Trainers. They watched Professor Kukui's announcement of the Manalo Stadium's completion.

Two Trainers' East Sea Gastrodon appeared in The Gates of Warp!, with one of them appearing in a flashback.

A Trainer's East Sea Gastrodon appeared in Showdown at the Gates of Warp!.

Pokédex entries

Episode Pokémon Source Entry DP097 Gastrodon (West Sea) Dawn's Pokédex Gastrodon, the Sea Slug Pokémon and the evolved form of Shellos. Gastrodon inhabits the shallow tidal pools of the ocean, and its sturdy shell serves to protect its body. DP186 Gastrodon (East Sea) Dawn's Pokédex Gastrodon, the Sea Slug Pokémon and the evolved form of Shellos. A sturdy shell covered Gastrodon's back long ago. Its cells still contain evidence of it today.

Episode Pokémon Source Entry JN117 Gastrodon (West Sea) Goh's Rotom Phone Gastrodon, the Sea Slug Pokémon. A Water and Ground type. Although Gastrodon has a flexible body, it is tough, allowing it to absorb sharp blows.

In the manga

West Sea Gastrodon in Pokémon Adventures

East Sea Gastrodon in Pokémon Adventures

Pokémon Adventures

A East Sea Gastrodon first appeared in Knowledge of the Unown I, under the ownership of a Pa.

Jupiter owns a West Sea Gastrodon, which debuted in Stopping Sableye. It was first used to battle Platinum, Maylene, and Candice at Lake Acuity.

In The Final Dimensional Duel V, a West Sea Gastrodon appeared in a flashback on Fullmoon Island as one of the Pokémon affected by Darkrai's Bad Dreams. It was rescued and healed by Palmer.

Hapu owns an East Sea Gastrodon, which first appeared in Battle in Vast Poni Canyon.

An East Sea Gastrodon appeared in Swaying!! Murky Memories.

In the TCG

Main article: Gastrodon (TCG)

Trivia

Early back sprite of Gastrodon

• According to an interview in Nintendo Power with Game Freak, Gastrodon and Shellos were originally intended for Pokémon Ruby and Sapphire.
• Both Shellos and Gastrodon have early back sprites within the game data of Pokémon Diamond and Pearl; however, there are no front sprites for these forms.
• In Diamond and Pearl, no in-game Trainer uses East Sea Gastrodon in battle, even on the east side of Mount Coronet.
• Prior to Generation VI, Gastrodon's shape was .
• Gastrodon and its pre-Evolution were accidentally released in Pokémon GO on April 29, 2019, but were removed shortly after. On May 17, 2019, they made their official debut along with various other Pokémon from Generation IV.
• Gastrodon was featured alongside several bovine Pokémon, namely Tauros, Miltank, and Bouffalant, in multiple promotional artworks created to celebrate New Year's 2021, also known as the Year of the Ox.
• The Pokémon Scarlet and Violet Pokédex entries mentioning a decrease in West Sea Gastrodon and an increase in East Sea Gastrodon may be an inverse on the changes in the populations of real life sea slug species due to climate change — with species that better survive in warmer waters becoming more common.

Origin

Gastrodon is based on a sea slug, perhaps one of the order Opisthobranchia. It may also be based on a sea hare, a type of sea slug that is also known to secrete purple fluid in self-defense. The tentacles on Gastrodon's head are shaped like cattle horns, which may be a visual pun on 海牛 umiushi (Japanese for sea slug, derived from 海 umi (sea) and 牛 ushi (cow; cattle)).

Name origin

Gastrodon may be a combination of gastropod or Gastropteron (genus of sea slug), and don (Spanish for lord) or -don (common suffix in dinosaur names derived from the Ancient Greek word for tooth).

Tritodon may be a combination of Tritoniidae (family of shell-less marine gastropod molluscs) or Triton snail (marine gastropod mollusk named after Triton, Greek god of the sea), and don (Spanish for lord) or -don (common suffix in dinosaur names derived from the Ancient Greek word for tooth). It may also be derived from torito (Spanish for little bull).

In other languages

Language Title Meaning Japanese トリトドン Tritodon From Tritoniidae, Triton snail, Triton, don, and -don; possibly also torito French Tritosor From Triton and -saurus Spanish Gastrodon Same as English name German Gastrodon Same as English name Italian Gastrodon Same as English name Korean 트리토돈 Tritodon Transcription of Japanese name Mandarin Chinese 海兔獸 / 海兔兽 Hǎitùshòu* 海牛獸 / 海牛兽 Hǎiniúshòu* From 海兔 hǎitù and 獸 / 兽 shòu From 海牛 hǎiniú and 獸 / 兽 shòu Cantonese Chinese 海兔獸 Hóitousau* 海牛獸 Hóingàuhsau * From 海兔 hóitou and 獸 sau From 海牛 hóingàuh and 獸 sau

More languages Hindi स्लगार Slugaar From slug Thai ไทรโทดอน Thraithodon Transcription of Japanese name

West Sea

Language Title Japanese にしのうみ Nishi no Umi Chinese Cantonese 西海 Sāihói Mandarin 西海 Xīhǎi French Mer Occident German Westliches Meer Hindi वेस्ट-सी West-Sea Indonesian Laut Barat Italian Mare Ovest Korean 서쪽바다 Seojjok Bada Malaysian Laut Barat Portuguese Brazil Mar Ocidental* Mar Oeste* Portugal Mar Oeste Spanish Mar Oeste Thai ทะเลตะวันตก Thale Tawantok Turkish Batı Denizi

East Sea

Language Title Japanese ひがしのうみ Higashi no Umi Chinese Cantonese 東海 Dūnghói Mandarin 東海 / 东海 Dōnghǎi French Mer Orient German Östliches Meer Hindi ईस्ट-सी East-Sea Indonesian Laut Timur Italian Mare Est Korean 동쪽바다 Dongjjok Bada Malaysian Laut Timur Portuguese Mar Leste Spanish Mar Este Thai ทะเลตะวันออก Thale Tawanok Turkish Doğu Denizi

Related articles

• Zoey's Gastrodon
• List of Pokémon with form differences

External links

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Pokémon

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This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.