Generation 1 · Pokédex profile
Hermit Crab Pokémon
Pokédex entry
Its tail has a Shellder firmly attached with a bite. As a result, the tail can't be used for fishing anymore. This forces it to reluctantly swim and catch prey.
Battle data
Pokédex entry
When bathed in the energy of Mega Evolution, Shellder converts into impregnable armor. There is virtually no change in Slowpoke.
Battle data
Pokédex entry
A Shellder bite set off a chemical reaction with the spices inside Slowbro's body, causing Slowbro to become a Poison-type Pokémon.
Battle data
Conditional evolutions can require additional game-specific prerequisites beyond the displayed method.
| Method | Location | Level | Evidence |
|---|---|---|---|
| Fishing | Cinnabar Island | Lv. 25–35 | Source-indexed, not individually verified |
| Fishing | Johto Victory Road B2f | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Seafoam Islands B1f | Lv. 33–35 | Source-indexed, not individually verified |
| Grass / ground | Seafoam Islands B2f | Lv. 32–34 | Source-indexed, not individually verified |
| Grass / ground | Seafoam Islands B3f | Lv. 32–34 | Source-indexed, not individually verified |
| Grass / ground | Seafoam Islands B4f | Lv. 32–34 | Source-indexed, not individually verified |
| Grass / ground | Two Island Cape Brink | Lv. 37–40 | Source-indexed, not individually verified |
| Grass / ground | Whirl Islands B2f | Lv. 26–28 | Source-indexed, not individually verified |
| Grass / ground | Whirl Islands B3f | Lv. 26–28 | Source-indexed, not individually verified |
| Surfing | Cerulean Cave 1f | Lv. 40–55 | Source-indexed, not individually verified |
| Surfing | Cerulean Cave B1f | Lv. 50–65 | Source-indexed, not individually verified |
| Surfing | Johto Victory Road B2f | Lv. 38–40 | Source-indexed, not individually verified |
| Surfing | Seafoam Islands B3f | Lv. 35–40 | Source-indexed, not individually verified |
| Surfing | Seafoam Islands B4f | Lv. 35–40 | Source-indexed, not individually verified |
| Surfing | Slowpoke Well B1f | Lv. 10–24 | Source-indexed, not individually verified |
| Surfing | Slowpoke Well B2f | Lv. 20–24 | Source-indexed, not individually verified |
| Surfing | Three Island Berry Forest | Lv. 35–40 | Source-indexed, not individually verified |
| Surfing | Two Island Cape Brink | Lv. 35–40 | Source-indexed, not individually verified |
| Grass (rare)Form: Slowbro Galar | Route 10 | Lv. 16 | Source-indexed, not individually verified |
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.