Trade Haunter with any Pokemon to make it evolve!
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you must trade your haunter to evolve it into a gengar
You have to trade to another game to make it evolve.
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.
Link trade!!!!!!!!! You have to trade for another Haunter in order for it to evolve into a Gengar