Gastrodon
#342 in the Ultra Sun & Ultra Moon Pokédex • Sea Slug Pokémon
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.
Pokédexes
Egg Group
Steps to Hatch
Effort Values Yielded
Gender Ratio
Capture Rate
Base Experience
| Pokémon | Requires | Evolution |
|---|---|---|
![]() Shellos #341 | Level 30 | ![]() Gastrodon #342 |
Ultra Moon
| Location | Method | Level | Chance | Conditions |
|---|---|---|---|---|
Ancient Poni Path | Surfing | 41-44 | 20% | - |
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 Breaker Coast | Surfing | 41-44 | 20% | - |
Poni Wilds | Walking in tall grass or a cave | 41-44 | 10% | - |
Ultra Sun
| Location | Method | Level | Chance | Conditions |
|---|---|---|---|---|
Ancient Poni Path | Surfing | 41-44 | 20% | - |
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 Breaker Coast | Surfing | 41-44 | 20% | - |
Poni Wilds | Walking in tall grass or a cave | 41-44 | 10% | - |

Normal

Shiny
Gastrodon
Sea Slug Pokémon


HP
111
Attack
83
Defense
68
Sp. Atk
92
Sp. Def
82
Speed
39
Total
475
Type Chart
Weaknesses
Takes 4× from

Resistances
Takes 0× from

Takes 0.5× from




| 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 | - | - | 5 | Restoring its own cells, the user restores its own HP by half of its max HP. |
| 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 | - | - | 5 | 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. |
| 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. |
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 moves to this Pokémon where possible. Absorbs Water 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 moves to 1.3× their power during a sandstorm. Protects against sandstorm damage.





















Status
Special
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