Have someone trade you a Haunter edit: i found one in cliff cave so i dont know but yeah link trade a haunter.
get somebody to trade you haunter or gengar
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Trade Haunter and you will get a Gengar.
To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.
To get Gengar you must link trade Gastly with a friend that has a 4th generation game (Diamond,Pearl,Platinum,Heartgold,Soulsilver) and then it will evolve into gengar.
gengar can defeat any Pokemon same with any other Pokemon
Gengar is a Ghost-Poison type.