Default-form artwork 
Generation 4 · Pokédex profile
Sea Slug Pokémon
Pokédex entry
It appears on shallow-water beaches to eat sand for nourishment. Should one Gastrodon encounter another of a different color, a fierce battle will ensue.
Battle data
Pokédex entry
It appears on shallow-water beaches to eat sand for nourishment. Should one Gastrodon encounter another of a different color, a fierce battle will ensue.
Battle data
Pokédex entry
Found more often on land than in the sea. They normally live in rocky seashores, but when cloudy or rainy, they can sometimes be found on mountains, far from the sea.
Battle data
Conditional evolutions can require additional game-specific prerequisites beyond the displayed method.
No direct acquisition source is indexed. Evolution or gifts may still provide a path.
Rare grass and Surfing encounters inherit the first native slot's level range. Supplemental fishing follows each rod's native slots. These ranges exclude Lure effects and randomizer replacements; eligibility restrictions still apply.
Data source: configured Grand Anthology Gen 1–9 species, forms and abilities. The website uses frame-cropped copies of the game's existing Pokémon sprites, which remain franchise/artist-owned assets. Some alternate forms use labeled default-form artwork when their individual sprite is unavailable. See acknowledgments for credits.