It depends on if you want superior stats (gastly) or a vast array of moves (haunter)
when your Pokemon played many games and if your Pokemon is strong enough. .
:P
atik rah. .
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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.