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