Default-form artwork 
Generation 3 · Pokédex profile
Weather Pokémon
Pokédex entry
It alters its form depending on the weather. Changes in the climate such as the temperature and humidity appear to affect its cellular structure.
Battle data
Pokédex entry
It alters its form depending on the weather. Changes in the climate such as the temperature and humidity appear to affect its cellular structure.
Battle data
Pokédex entry
Castform takes this form on bright days. In an experiment where is was placed in front of a heater, it didn't change to this form. Its body is warm and toasty.
Battle data
Pokédex entry
This is Castform's form while it's raining. In an experiment where it was placed in a shower, it didn't change to this form. Its body is soft, slightly swollen with water.
Battle data
Pokédex entry
This is Castform's form in a hailstorm. In an experiment where it was placed in a freezer, it didn't change to this form. Its cold skin is as smooth as ice.
Battle data
No conventional evolution relationship is recorded for this species.
Conditional evolutions can require additional game-specific prerequisites beyond the displayed method.
| Method | Location | Level | Evidence |
|---|---|---|---|
| Gift candidateForm: Castform Normal | Route 119 Weather Institute 2f | Lv. 25 | Source-indexed, not individually verified |
| Gift candidate | Safari Zone Gate Safari Zone Entrance | Lv. 5 | 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.