Generation 1 · Pokédex profile
Gas Pokémon
Pokédex entry
When exposed to a strong wind, a Gastly's gaseous body quickly dwindles away. They cluster under the eaves of houses to escape the ravages of wind.
Battle data
Conditional evolutions can require additional game-specific prerequisites beyond the displayed method.
| Method | Location | Level | Evidence |
|---|---|---|---|
| Grass / ground | Five Island Lost Cave Room1 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room10 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room11 | Lv. 40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room12 | Lv. 40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room13 | Lv. 40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room14 | Lv. 40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room2 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room3 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room4 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room5 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room6 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room7 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room8 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Five Island Lost Cave Room9 | Lv. 38–40 | Source-indexed, not individually verified |
| Grass / ground | Pokemon Tower 3f | Lv. 13–19 | Source-indexed, not individually verified |
| Grass / ground | Pokemon Tower 4f | Lv. 13–19 | Source-indexed, not individually verified |
| Grass / ground | Pokemon Tower 5f | Lv. 13–19 | Source-indexed, not individually verified |
| Grass / ground | Pokemon Tower 6f | Lv. 14–19 | Source-indexed, not individually verified |
| Grass / ground | Pokemon Tower 7f | Lv. 15–19 | Source-indexed, not individually verified |
| Grass / ground | Sprout Tower 3f | Lv. 5–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 2f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 3f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 4f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 5f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 6f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 7f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 8f | Lv. 4–6 | Source-indexed, not individually verified |
| Grass / ground | Tin Tower 9f | Lv. 4–6 | 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.