you have to trade him. If you have anyother questions on Pokemon go to serebii.net.
Chat with our AI personalities
25 into Haunter and then if u trade Haunter he evolves into Gengar
You will need to level up Haunter to level 50 to evolve it in Pokemon Resolute.
Haunter evolves through a trade.
you have to trade
no level you have to trade dude