Raise it to Lv 26, it will try again to evolve into Haunter. Unless you have an everstone attach. Gastly will attempt again every level up.
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gastly evolve on level 25
Level 25
Gastly evolves at LV. 25
Gastly evolves at level 25.
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.