Gastly
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Gastly is a Pokémon introduced in Generation I (Kanto).
Gastly evolves into Haunter when given an Evo Candy. Haunter evolves into Gengar by trading.
There is a chance for Haunter to be reverted into Gastly when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3.