you and a friend link up an trade hunter for hunter then both of you get the relly strong pokemon ginggar
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if you have a medicham you can trade a girl in snowpoint city for a hunter and it'll evolve into a gengar. Or, you can trade a hauntur with another trainer and it will evolve.
You have to find your friend, you trade your Haunter with another Pokemon and when the trade is done Haunter will evolve.
Any level! You just have to trade it, to evolve it!
You have to trade with a friend at a pokemon center. I suggest trading kadabra for hunter. They will both evolve.
You cannot evolve without trading, you should just trade with lots of people until you get a gangar