Trade Haunter with any Pokemon to make it evolve!
Haunter evolves into Gengar via Trading.
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 have to trade to another game to make it evolve.
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.
Haunter evolves into Gengar when you 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
OF COURSE!! you'll need to trade an haunter to a friend, and haunter will evolve TO GENGAR
You have to trade haunter to a friend to evolve it.
Haunter will only evolve through trade.
Gastly evolves into Haunter at level 25, then trade it and it will evolve again into Gengar.