You evole haunter by trading it with a friend :D
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It will evolve if you trade it to someone else.. After the trade has been made, it will evolve to Gengar
To get a Gengar you must first catch a Haunter. To evolve the Haunter you have to trade it to another gaming system.
You mean how you get Gengar then train a gastly to level 25 it will evolve to Haunter then trade to a friend who has firered or leafgreen your haunter and then take it back when you receive it it will be a gengar.
Haunter does not evolve into Gengar at a certain level. Haunter needs to be traded to another player. Once he is traded, he will evolve.
Haunter does NOT evolve by level. You evolve Haunter by trading it with a friend, and then they trade it back to you. Hope I helped :)Haunter evolves from Gastly at level 25.Haunter evolves into Gengar through trade.Haunter evolves into Gengar by trading it.