Gastrodon East
#342 in the Ultra Sun & Ultra Moon Pokédex • Sea Slug Pokémon
Pokédex entries
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.
Details
Types


Category
Height
Weight
National Pokédex
Pokédex
Stats
Min
Max
HP
111
332
426
Attack
83
153
291
Defense
68
126
258
Sp. Atk
92
170
311
Sp. Def
82
152
289
Speed
39
74
194
Total
475
Ranges are for Level 100. Max assumes a beneficial nature, 252 EVs, and 31 IVs; min assumes a hindering nature, 0 EVs, and 0 IVs.
Growth
| Pokédexes | Alola #342Poni #89 |
|---|---|
| EV yield | 2 HP |
| Catch rate | 75 |
| Base Exp. | 166 |
Evolution
| Pokémon | Requires | Evolution |
|---|---|---|
![]() Shellos #341 | Level up East Sea Shellos at level 30 or higher; its East Sea form is preserved. | ![]() Gastrodon #342 |
Encounters
Ultra Moon| Location | Method | Level | Chance | Conditions |
|---|---|---|---|---|
Exeggutor Island | Walking in tall grass or a cave | 42-45 | 10% | - |
Poni Breaker Coast | Surfing | 41-44 | 20% | - |
Ancient Poni Path | Walking in tall grass or a cave | 41-44 | 10% | - |
Poni Wilds | Walking in tall grass or a cave | 41-44 | 10% | - |
Ultra Sun| Location | Method | Level | Chance | Conditions |
|---|---|---|---|---|
Ancient Poni Path | Walking in tall grass or a cave | 41-44 | 10% | - |
Exeggutor Island | Walking in tall grass or a cave | 42-45 | 10% | - |
Poni Wilds | Walking in tall grass or a cave | 41-44 | 10% | - |
Poni Breaker Coast | Surfing | 41-44 | 20% | - |
Moves
| Class | Description | ||||||
|---|---|---|---|---|---|---|---|
| Start | Harden | ![]() | Status | - | - | 30 | The user stiffens all the muscles in its body to raise its Defense stat. |
| Start | Mud-Slap | ![]() | Special | 20 | 100 | 10 | The user hurls mud in the target’s face to inflict damage and lower its accuracy. |
| Start | Mud Sport | ![]() | Status | - | - | 15 | The user kicks up mud on the battlefield. This weakens Electric-type moves for five turns. |
| Start | Water Pulse | ![]() | Special | 60 | 100 | 20 | The user attacks the target with a pulsing blast of water. This may also confuse the target. |
| 2 | Mud Sport | ![]() | Status | - | - | 15 | The user kicks up mud on the battlefield. This weakens Electric-type moves for five turns. |
| 4 | Harden | ![]() | Status | - | - | 30 | The user stiffens all the muscles in its body to raise its Defense stat. |
| 7 | Water Pulse | ![]() | Special | 60 | 100 | 20 | The user attacks the target with a pulsing blast of water. This may also confuse the target. |
| 11 | Mud Bomb | ![]() | Special | 65 | 85 | 10 | The user launches a hard-packed mud ball to attack. This may also lower the target’s accuracy. |
| 16 | Hidden Power | ![]() | Special | 60 | 100 | 15 | A unique attack that varies in type depending on the Pokémon using it. |
| 22 | Rain Dance | ![]() | Status | - | - | 5 | The user summons a heavy rain that falls for five turns, powering up Water-type moves. It lowers the power of Fire-type moves. |
| 29 | Body Slam | ![]() | Physical | 85 | 100 | 15 | The user drops onto the target with its full body weight. This may also leave the target with paralysis. |
| 41 | Muddy Water | ![]() | Special | 90 | 85 | 10 | The user attacks by shooting muddy water at the opposing Pokémon. This may also lower their accuracy. |
| 54 | Recover | ![]() | Status | - | - | 10 | Restoring its own cells, the user restores its own HP by half of its max HP. |
Machines
| Class | Description | ||||||
|---|---|---|---|---|---|---|---|
| TM06 | Toxic | ![]() | Status | - | 90 | 10 | A move that leaves the target badly poisoned. Its poison damage worsens every turn. |
| TM07 | Hail | ![]() | Status | - | - | 10 | The user summons a hailstorm lasting five turns. It damages all Pokémon except the Ice type. |
| TM10 | Hidden Power | ![]() | Special | 60 | 100 | 15 | A unique attack that varies in type depending on the Pokémon using it. |
| TM13 | Ice Beam | ![]() | Special | 90 | 100 | 10 | The target is struck with an icy-cold beam of energy. This may also leave the target frozen. |
| TM14 | Blizzard | ![]() | Special | 110 | 70 | 5 | A howling blizzard is summoned to strike opposing Pokémon. This may also leave the opposing Pokémon frozen. |
| TM15 | Hyper Beam | ![]() | Special | 150 | 90 | 5 | The target is attacked with a powerful beam. The user can’t move on the next turn. |
| TM17 | Protect | ![]() | Status | - | - | 10 | Enables the user to evade all attacks. Its chance of failing rises if it is used in succession. |
| TM18 | Rain Dance | ![]() | Status | - | - | 5 | The user summons a heavy rain that falls for five turns, powering up Water-type moves. It lowers the power of Fire-type moves. |
| TM21 | Frustration | ![]() | Physical | - | 100 | 20 | This full-power attack grows more powerful the less the user likes its Trainer. |
| TM26 | Earthquake | ![]() | Physical | 100 | 100 | 10 | The user sets off an earthquake that strikes every Pokémon around it. |
| TM27 | Return | ![]() | Physical | - | 100 | 20 | This full-power attack grows more powerful the more the user likes its Trainer. |
| TM32 | Double Team | ![]() | Status | - | - | 15 | By moving rapidly, the user makes illusory copies of itself to raise its evasiveness. |
| TM34 | Sludge Wave | ![]() | Special | 95 | 100 | 10 | The user strikes everything around it by swamping the area with a giant sludge wave. This may also poison those hit. |
| TM36 | Sludge Bomb | ![]() | Special | 90 | 100 | 10 | Unsanitary sludge is hurled at the target. This may also poison the target. |
| TM37 | Sandstorm | ![]() | Status | - | - | 10 | A five-turn sandstorm is summoned to hurt all combatants except the Rock, Ground, and Steel types. It raises the Sp. Def stat of Rock types. |
| TM39 | Rock Tomb | ![]() | Physical | 60 | 95 | 15 | Boulders are hurled at the target. This also lowers the target’s Speed stat by preventing its movement. |
| TM42 | Facade | ![]() | Physical | 70 | 100 | 20 | This attack move doubles its power if the user is poisoned, burned, or paralyzed. |
| TM44 | Rest | ![]() | Status | - | - | 10 | The user goes to sleep for two turns. This fully restores the user’s HP and heals any status conditions. |
| TM45 | Attract | ![]() | Status | - | 100 | 15 | If it is the opposite gender of the user, the target becomes infatuated and less likely to attack. |
| TM48 | Round | ![]() | Special | 60 | 100 | 15 | The user attacks the target with a song. Others can join in the Round to increase the power of the attack. |
| TM55 | Scald | ![]() | Special | 80 | 100 | 15 | The user shoots boiling hot water at its target. This may also leave the target with a burn. |
| TM68 | Giga Impact | ![]() | Physical | 150 | 90 | 5 | The user charges at the target using every bit of its power. The user can’t move on the next turn. |
| TM71 | Stone Edge | ![]() | Physical | 100 | 80 | 5 | The user stabs the target from below with sharpened stones. Critical hits land more easily. |
| TM78 | Bulldoze | ![]() | Physical | 60 | 100 | 20 | The user strikes everything around it by stomping down on the ground. This lowers the Speed stat of those hit. |
| TM80 | Rock Slide | ![]() | Physical | 75 | 90 | 10 | Large boulders are hurled at the opposing Pokémon to inflict damage. This may also make the opposing Pokémon flinch. |
| TM83 | Infestation | ![]() | Special | 20 | 100 | 20 | The target is infested and attacked for four to five turns. The target can’t flee during this time. |
| TM87 | Swagger | ![]() | Status | - | 85 | 15 | The user enrages and confuses the target. However, this also sharply raises the target’s Attack stat. |
| TM88 | Sleep Talk | ![]() | Status | - | - | 10 | While it is asleep, the user randomly uses one of the moves it knows. |
| TM90 | Substitute | ![]() | Status | - | - | 10 | The user makes a copy of itself using some of its HP. The copy serves as the user’s decoy. |
| TM94 | Surf | ![]() | Special | 90 | 100 | 15 | The user attacks everything around it by swamping its surroundings with a giant wave. |
| TM98 | Waterfall | ![]() | Physical | 80 | 100 | 15 | The user charges at the target and may make it flinch. |
| TM100 | Confide | ![]() | Status | - | - | 20 | The user tells the target a secret, and the target loses its ability to concentrate. This lowers the target’s Sp. Atk stat. |
Tutors
| Class | Description | |||||
|---|---|---|---|---|---|---|
| Block | ![]() | Status | - | - | 5 | The user blocks the target’s way with arms spread wide to prevent escape. |
| Earth Power | ![]() | Special | 90 | 100 | 10 | The user makes the ground under the target erupt with power. This may also lower the target’s Sp. Def stat. |
| Icy Wind | ![]() | Special | 55 | 95 | 15 | The user attacks with a gust of chilled air. This also lowers the opposing Pokémon’s Speed stats. |
| Pain Split | ![]() | Status | - | - | 20 | The user adds its HP to the target’s HP, then equally shares the combined HP with the target. |
| Snore | ![]() | Special | 50 | 100 | 15 | This attack can be used only if the user is asleep. The harsh noise may also make the target flinch. |
| Stomping Tantrum | ![]() | Physical | 75 | 100 | 10 | Driven by frustration, the user attacks the target. If the user’s previous move has failed, the power of this move doubles. |
| Water Pulse | ![]() | Special | 60 | 100 | 20 | The user attacks the target with a pulsing blast of water. This may also confuse the target. |
| Class | Acquisition source | Description | |||||
|---|---|---|---|---|---|---|---|
| Acid Armor | ![]() | Status | - | - | 20 | Shellos East — breeding; retain through evolution | The user alters its cellular structure to liquefy itself, sharply raising its Defense stat. |
| Acid Armor | ![]() | Status | - | - | 20 | Shellos — breeding; retain through evolution | The user alters its cellular structure to liquefy itself, sharply raising its Defense stat. |
| Amnesia | ![]() | Status | - | - | 20 | Shellos East — breeding; retain through evolution | The user temporarily empties its mind to forget its concerns. This sharply raises the user’s Sp. Def stat. |
| Amnesia | ![]() | Status | - | - | 20 | Shellos — breeding; retain through evolution | The user temporarily empties its mind to forget its concerns. This sharply raises the user’s Sp. Def stat. |
| Brine | ![]() | Special | 65 | 100 | 10 | Shellos East — breeding; retain through evolution | If the target’s HP is half or less, this attack will hit with double the power. |
| Brine | ![]() | Special | 65 | 100 | 10 | Shellos — breeding; retain through evolution | If the target’s HP is half or less, this attack will hit with double the power. |
| Clear Smog | ![]() | Special | 50 | - | 15 | Shellos East — breeding; retain through evolution | The user attacks by throwing a clump of special mud. All stat changes are returned to normal. |
| Clear Smog | ![]() | Special | 50 | - | 15 | Shellos — breeding; retain through evolution | The user attacks by throwing a clump of special mud. All stat changes are returned to normal. |
| Counter | ![]() | Physical | - | 100 | 20 | Shellos East — breeding; retain through evolution | A retaliation move that counters any physical attack, inflicting double the damage taken. |
| Counter | ![]() | Physical | - | 100 | 20 | Shellos — breeding; retain through evolution | A retaliation move that counters any physical attack, inflicting double the damage taken. |
| Curse | ![]() | Status | - | - | 10 | Shellos East — breeding; retain through evolution | A move that works differently for the Ghost type than for all other types. |
| Curse | ![]() | Status | - | - | 10 | Shellos — breeding; retain through evolution | A move that works differently for the Ghost type than for all other types. |
| Fissure | ![]() | Physical | - | 30 | 5 | Shellos East — breeding; retain through evolution | The user opens up a fissure in the ground and drops the target in. The target faints instantly if this attack hits. |
| Fissure | ![]() | Physical | - | 30 | 5 | Shellos — breeding; retain through evolution | The user opens up a fissure in the ground and drops the target in. The target faints instantly if this attack hits. |
| Memento | ![]() | Status | - | 100 | 10 | Shellos East — breeding; retain through evolution | The user faints when using this move. In return, this harshly lowers the target’s Attack and Sp. Atk stats. |
| Memento | ![]() | Status | - | 100 | 10 | Shellos — breeding; retain through evolution | The user faints when using this move. In return, this harshly lowers the target’s Attack and Sp. Atk stats. |
| Mirror Coat | ![]() | Special | - | 100 | 20 | Shellos East — breeding; retain through evolution | A retaliation move that counters any special attack, inflicting double the damage taken. |
| Mirror Coat | ![]() | Special | - | 100 | 20 | Shellos — breeding; retain through evolution | A retaliation move that counters any special attack, inflicting double the damage taken. |
| Mist | ![]() | Status | - | - | 30 | Shellos East — breeding; retain through evolution | The user cloaks itself and its allies in a white mist that prevents any of their stats from being lowered for five turns. |
| Mist | ![]() | Status | - | - | 30 | Shellos — breeding; retain through evolution | The user cloaks itself and its allies in a white mist that prevents any of their stats from being lowered for five turns. |
| Sludge | ![]() | Special | 65 | 100 | 20 | Shellos East — breeding; retain through evolution | Unsanitary sludge is hurled at the target. This may also poison the target. |
| Sludge | ![]() | Special | 65 | 100 | 20 | Shellos — breeding; retain through evolution | Unsanitary sludge is hurled at the target. This may also poison the target. |
| Spit Up | ![]() | Special | - | 100 | 10 | Shellos East — breeding; retain through evolution | The power stored using the move Stockpile is released at once in an attack. The more power is stored, the greater the move’s power. |
| Spit Up | ![]() | Special | - | 100 | 10 | Shellos — breeding; retain through evolution | The power stored using the move Stockpile is released at once in an attack. The more power is stored, the greater the move’s power. |
| Stockpile | ![]() | Status | - | - | 20 | Shellos East — breeding; retain through evolution | The user charges up power and raises both its Defense and Sp. Def stats. The move can be used three times. |
| Stockpile | ![]() | Status | - | - | 20 | Shellos — breeding; retain through evolution | The user charges up power and raises both its Defense and Sp. Def stats. The move can be used three times. |
| Swallow | ![]() | Status | - | - | 10 | Shellos East — breeding; retain through evolution | The power stored using the move Stockpile is absorbed by the user to heal its HP. Storing more power heals more HP. |
| Swallow | ![]() | Status | - | - | 10 | Shellos — breeding; retain through evolution | The power stored using the move Stockpile is absorbed by the user to heal its HP. Storing more power heals more HP. |
| Trump Card | ![]() | Special | - | - | 5 | Shellos East — breeding; retain through evolution | The fewer PP this move has, the greater its power. |
| Trump Card | ![]() | Special | - | - | 5 | Shellos — breeding; retain through evolution | The fewer PP this move has, the greater its power. |
| Yawn | ![]() | Status | - | - | 10 | Shellos East — breeding; retain through evolution | The user lets loose a huge yawn that lulls the target into falling asleep on the next turn. |
| Yawn | ![]() | Status | - | - | 10 | Shellos — breeding; retain through evolution | The user lets loose a huge yawn that lulls the target into falling asleep on the next turn. |
| Class | Acquisition source | Description | |||||
|---|---|---|---|---|---|---|---|
| Acid Armor | ![]() | Status | - | - | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user alters its cellular structure to liquefy itself, sharply raising its Defense stat. |
| Amnesia | ![]() | Status | - | - | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user temporarily empties its mind to forget its concerns. This sharply raises the user’s Sp. Def stat. |
| Ancient Power | ![]() | Special | 60 | 100 | 5 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user attacks with a prehistoric power. This may also raise all the user’s stats at once. |
| Brine | ![]() | Special | 65 | 100 | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | If the target’s HP is half or less, this attack will hit with double the power. |
| Captivate | ![]() | Status | - | 100 | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | If any opposing Pokémon is the opposite gender of the user, it is charmed, which harshly lowers its Sp. Atk stat. |
| Clear Smog | ![]() | Special | 50 | - | 15 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user attacks by throwing a clump of special mud. All stat changes are returned to normal. |
| Counter | ![]() | Physical | - | 100 | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | A retaliation move that counters any physical attack, inflicting double the damage taken. |
| Curse | ![]() | Status | - | - | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | A move that works differently for the Ghost type than for all other types. |
| Dive | ![]() | Physical | 80 | 100 | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | Diving on the first turn, the user floats up and attacks on the next turn. |
| Endure | ![]() | Status | - | - | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user endures any attack with at least 1 HP. Its chance of failing rises if it is used in succession. |
| Fissure | ![]() | Physical | - | 30 | 5 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user opens up a fissure in the ground and drops the target in. The target faints instantly if this attack hits. |
| Headbutt | ![]() | Physical | 70 | 100 | 15 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user sticks out its head and attacks by charging straight into the target. This may also make the target flinch. |
| Memento | ![]() | Status | - | 100 | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user faints when using this move. In return, this harshly lowers the target’s Attack and Sp. Atk stats. |
| Mirror Coat | ![]() | Special | - | 100 | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | A retaliation move that counters any special attack, inflicting double the damage taken. |
| Mist | ![]() | Status | - | - | 30 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user cloaks itself and its allies in a white mist that prevents any of their stats from being lowered for five turns. |
| Natural Gift | ![]() | Physical | - | 100 | 15 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user draws power to attack by using its held Berry. The Berry determines the move’s type and power. |
| Secret Power | ![]() | Physical | 70 | 100 | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The additional effects of this attack depend upon where it was used. |
| Sludge | ![]() | Special | 65 | 100 | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | Unsanitary sludge is hurled at the target. This may also poison the target. |
| Spit Up | ![]() | Special | - | 100 | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The power stored using the move Stockpile is released at once in an attack. The more power is stored, the greater the move’s power. |
| Stockpile | ![]() | Status | - | - | 20 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user charges up power and raises both its Defense and Sp. Def stats. The move can be used three times. |
| String Shot | ![]() | Status | - | 95 | 40 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The opposing Pokémon are bound with silk blown from the user’s mouth that harshly lowers the Speed stat. |
| Swallow | ![]() | Status | - | - | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The power stored using the move Stockpile is absorbed by the user to heal its HP. Storing more power heals more HP. |
| Trump Card | ![]() | Special | - | - | 5 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The fewer PP this move has, the greater its power. |
| Whirlpool | ![]() | Special | 35 | 85 | 15 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user traps the target in a violent swirling whirlpool for four to five turns. |
| Yawn | ![]() | Status | - | - | 10 | Import from compatible Generation III–VI games using the required transfer chain and Pokémon Bank; retain through evolution where applicable | The user lets loose a huge yawn that lulls the target into falling asleep on the next turn. |
Traits
Sticky Hold
Ability Slot 1
Items held by the Pokémon are stuck fast and cannot be removed by other Pokémon.
Prevents a held item from being removed by other Pokémon.
Storm Drain
Ability Slot 2
Draws in all Water-type moves. Instead of being hit by Water-type moves, it boosts its Sp. Atk.
Redirects single-target Water-type moves to this Pokémon where possible. Absorbs Water-type moves, raising Special Attack one stage.
Sand Force(Hidden Ability)
Boosts the power of Rock-, Ground-, and Steel-type moves in a sandstorm.
Strengthens Rock-, Ground-, and Steel-type moves to 1.3× their power during a sandstorm. Protects against sandstorm damage.









































Status
Special
Physical








