if you are talking about Pokemon you simply trade it to another persons game and it will evolve once its traded you can trade back after and you will have a gengar same applies for alakazam and various other Pokemon too.(some Pokemon are required to be traded while holding a specific item before they will evolve like onix to steelix where onix need to be holding a metal coat)
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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.