The lost tower by Solaceon Town, or in the Eterna side of the Eterna Forest.
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Gastly evolves at level 22 then Haunter evolves by trading it.
gengar haunter gastly
Gastly evolves into Haunter once it reaches level 25 or higher.
at lvl 25 hope it help
You can get gastly at the Lost Tower or in the Eterna Forest