haunter has to be traded to evlove
haunter evolve into gengar in level 42
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you have to trade
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
The only way is to trade it. You'll need to trade for a Haunter or Gengar if you want to own one.