Gastrodon
#423 in the HeartGold & SoulSilver Pokédex • Sea Slug Pokémon
Gastrodon
#423 in the HeartGold & SoulSilver Pokédex • Sea Slug Pokémon
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.

Normal

Shiny
Gastrodon
Sea Slug Pokémon


Growth
| Pokédexes | - |
|---|---|
| EV yield | 2 HP |
| Catch rate | 75 |
| Base Exp. | 166 |
Lore

HeartGold
When its natural enemy attacks, it oozes purple fluid and escapes.

SoulSilver
When its natural enemy attacks, it oozes purple fluid and escapes.
Evolution
| Pokémon | Requires | Evolution |
|---|---|---|
![]() Shellos #422 | Level 30 | ![]() Gastrodon #423 |
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 foe’s face to inflict damage and lower its accuracy. |
| Start | Mud Sport | ![]() | Status | - | - | 15 | The user covers itself with mud. It weakens Electric- type moves while the user is in the battle. |
| Start | Water Pulse | ![]() | Special | 60 | 100 | 20 | The user attacks the foe with a pulsing blast of water. It may also confuse the foe. |
| 2 | Mud Sport | ![]() | Status | - | - | 15 | The user covers itself with mud. It weakens Electric- type moves while the user is in the battle. |
| 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 foe with a pulsing blast of water. It may also confuse the foe. |
| 11 | Mud Bomb | ![]() | Special | 65 | 85 | 10 | The user launches a hard-packed mud ball to attack. It may also lower the target’s accuracy. |
| 16 | Hidden Power | ![]() | Special | 1 | 100 | 15 | A unique attack that varies in type and intensity 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. |
| 29 | Body Slam | ![]() | Physical | 85 | 100 | 15 | The user drops onto the foe with its full body weight. It may leave the foe paralyzed. |
| 41 | Muddy Water | ![]() | Special | 95 | 85 | 10 | The user attacks by shooting out muddy water. It may also lower the foe’s accuracy. |
| 54 | Recover | ![]() | Status | - | - | 5 | A self-healing move. The user restores its own HP by up to half of its max HP. |
Machines
| Class | Description | ||||||
|---|---|---|---|---|---|---|---|
| TM03 | Water Pulse | ![]() | Special | 60 | 100 | 20 | The user attacks the foe with a pulsing blast of water. It may also confuse the foe. |
| TM06 | Toxic | ![]() | Status | - | 85 | 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 | 1 | 100 | 15 | A unique attack that varies in type and intensity depending on the Pokémon using it. |
| TM13 | Ice Beam | ![]() | Special | 95 | 100 | 10 | The foe is struck with an icy-cold beam of energy. It may also freeze the target solid. |
| TM14 | Blizzard | ![]() | Special | 120 | 70 | 5 | A howling blizzard is summoned to strike the foe. It may also freeze the target solid. |
| TM15 | Hyper Beam | ![]() | Special | 150 | 90 | 5 | The foe is attacked with a powerful beam. The user must rest on the next turn to regain its energy. |
| TM17 | Protect | ![]() | Status | - | - | 10 | It 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. |
| TM21 | Frustration | ![]() | Physical | - | 100 | 20 | A full-power attack that grows more powerful the less the user likes its Trainer. |
| TM26 | Earthquake | ![]() | Physical | 100 | 100 | 10 | The user sets off an earthquake that hits all the Pokémon in the battle. |
| TM27 | Return | ![]() | Physical | - | 100 | 20 | A full-power attack that grows more powerful the more the user likes its Trainer. |
| TM28 | Dig | ![]() | Physical | 80 | 100 | 10 | The user burrows, then attacks on the second turn. It can also be used to exit dungeons. |
| TM32 | Double Team | ![]() | Status | - | - | 15 | By moving rapidly, the user makes illusory copies of itself to raise its evasiveness. |
| TM36 | Sludge Bomb | ![]() | Special | 90 | 100 | 10 | The user attacks by hurling filthy sludge at the foe. It may also poison the target. |
| TM37 | Sandstorm | ![]() | Status | - | - | 10 | A five-turn sand storm is summoned to hurt all combatant types except Rock, Ground, and Steel. |
| TM39 | Rock Tomb | ![]() | Physical | 50 | 80 | 10 | Boulders are hurled at the foe. It also lowers the foe’s Speed by preventing its movement. |
| TM42 | Facade | ![]() | Physical | 70 | 100 | 20 | An attack move that doubles its power if the user is poisoned, paralyzed, or has a burn. |
| TM43 | Secret Power | ![]() | Physical | 70 | 100 | 20 | The user attacks with a secret power. Its added effects vary depending on the user’s environment. |
| TM44 | Rest | ![]() | Status | - | - | 5 | The user goes to sleep for two turns. It fully restores the user’s HP and heals any status problem. |
| TM45 | Attract | ![]() | Status | - | 100 | 15 | If it is the opposite gender of the user, the foe becomes infatuated and less likely to attack. |
| TM55 | Brine | ![]() | Special | 65 | 100 | 10 | If the foe’s HP is down to about half, this attack will hit with double the power. |
| TM58 | Endure | ![]() | Status | - | - | 10 | The user endures any attack with at least 1 HP. Its chance of failing rises if it is used in succession. |
| TM68 | Giga Impact | ![]() | Physical | 150 | 90 | 5 | The user charges at the foe using every bit of its power. The user must rest on the next turn. |
| TM70 | Flash | ![]() | Status | - | 100 | 20 | The user flashes a light that cuts the foe’s accuracy. It can also be used to illuminate caves. |
| TM71 | Stone Edge | ![]() | Physical | 100 | 80 | 5 | The user stabs the foe with a sharpened stone. It has a high critical-hit ratio. |
| TM78 | Captivate | ![]() | Status | - | 100 | 20 | If it is the opposite gender of the user, the foe is charmed into sharply lowering its Sp. Atk stat. |
| TM80 | Rock Slide | ![]() | Physical | 75 | 90 | 10 | Large boulders are hurled at the foe to inflict damage. It may also make the target flinch. |
| TM82 | Sleep Talk | ![]() | Status | - | - | 10 | While it is asleep, the user randomly uses one of the moves it knows. |
| TM83 | Natural Gift | ![]() | Physical | - | 100 | 15 | The user draws power to attack by using its held Berry. The Berry determines its type and power. |
| TM87 | Swagger | ![]() | Status | - | 90 | 15 | The user enrages the foe into confusion. However, it also sharply raises the foe’s Attack stat. |
| TM90 | Substitute | ![]() | Status | - | - | 10 | The user makes a copy of itself using some of its HP. The copy serves as the user’s decoy. |
| HM03 | Surf | ![]() | Special | 95 | 100 | 15 | It swamps the entire battlefield with a giant wave. It can also be used for crossing water. |
| HM04 | Strength | ![]() | Physical | 80 | 100 | 15 | The foe is slugged with a punch thrown at maximum power. It can also be used to move boulders. |
| HM05 | Whirlpool | ![]() | Special | 15 | 70 | 15 | Traps the foe inside a whirlpool that lasts for two to five turns. The user can pass through whirlpools. |
| HM06 | Rock Smash | ![]() | Physical | 40 | 100 | 15 | The user hits with a punch that may lower the target’s Defense. It can also smash cracked boulders. |
| HM07 | Waterfall | ![]() | Physical | 80 | 100 | 15 | The user charges at the foe rapidly, and may make it flinch. It can also be used to climb a waterfall. |
Tutors
| Class | Description | |||||
|---|---|---|---|---|---|---|
| Ancient Power | ![]() | Special | 60 | 100 | 5 | The user attacks with a prehistoric power. It may also raise all the user’s stats at once. |
| Block | ![]() | Status | - | - | 5 | The user blocks the foe’s way with arms spread wide to prevent escape. |
| Dive | ![]() | Physical | 80 | 100 | 10 | A two-turn attack. The user dives underwater on the first turn, then hits on the next turn. |
| Earth Power | ![]() | Special | 90 | 100 | 10 | The user makes the ground under the foe erupt with power. It may also lower the target’s Sp. Def. |
| Headbutt | ![]() | Physical | 70 | 100 | 15 | The user attacks with its head. It may make the foe flinch. To find Pokémon, hit trees. |
| Icy Wind | ![]() | Special | 55 | 95 | 15 | The user attacks with a gust of chilled air. It also lowers the target’s Speed stat. |
| Mud-Slap | ![]() | Special | 20 | 100 | 10 | The user hurls mud in the foe’s face to inflict damage and lower its accuracy. |
| Pain Split | ![]() | Status | - | - | 20 | The user adds its HP to the foe’s HP, then equally shares the combined HP with the foe. |
| Snore | ![]() | Special | 40 | 100 | 15 | An attack that can be used only if the user is asleep. The harsh noise may also make the foe flinch. |
| String Shot | ![]() | Status | - | 95 | 40 | The foe is bound with silk blown from the user’s mouth. It reduces the target’s Speed stat. |
Traits
Sticky Hold
Ability Slot 1
Protects the Pokémon from item theft.
Prevents a held item from being removed by other Pokémon.
Storm Drain
Ability Slot 2
The Pokémon draws in all Water-type moves.
Redirects single-target Water moves to this Pokémon where possible. Absorbs Water moves, raising Special Attack one stage.





































Status
Special
Physical





