You have to get your Haunter to lv. 40 or higher. I just evolved my Gastly, then gave it like, 20 rare candies, traded it, it evolved with my friend, and he traded it back.
yes it evolves into gengar when you trade haunter
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Haunter doesn't evolve at any level to evolve your haunter you need to do a link trade with a friend and he he will then evolve
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.
you must trade your haunter to evolve it into a gengar
haunter has to be traded to evlove haunter evolve into gengar in level 42
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.