Haunter evolves when traded
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Nothing, to evolve haunter you have to trade him...
you trade him. and he will evolve into gengar. you trade him. and he will evolve into gengar.
25 into Haunter and then if u trade Haunter he evolves into Gengar
you have to trade him. If you have anyother questions on Pokemon go to serebii.net.
You have to trade the Pokemon to evolve it.