It evolves into Haunter at level 25, and then into Gengar by trading Haunter to another Pokemon game.
The way u can get gengar is to evole gastly all the way to haunter than trade it wih someone than u get gengar
onix evole from gedude
in platinum what leve does staravia evole
haunter then gastly
Gastly evolves at level 25.
gastly evolve on level 25
No, it does not.
no
No
No.
gastly evolves at level 26
Gastly evolves at LV. 25