Gastly evolves once it reaches level 18. It evolves into a Haunter. To evolve Haunter into a Gengar, you must trade it to another player.
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Gastly evolves at level 22 then Haunter evolves by trading it.
Gastly evolves into Haunter once it reaches level 25 or higher.
Gaspar is not a Pokemon well anyway it's gastly he evolves around level 18 and 20
Gastly evolves at level 25.
gastly evolve on level 25