You have to find your friend, you trade your Haunter with another Pokemon and when the trade is done Haunter will evolve.
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Haunter does not evolve by level into Gengar. You must trade it if you want it to evolve. If you don't have a second DS, or a friend to trade with, you can use this trick. 1. Must have Wi-Fi connection. 2. Go to the Global Trade Station (GTS), deposit your Haunter, and ask for a level 100 Abra girl so that it won't be traded. 3. Trade once for a Bidoof, Geodude, or whatever. 4. Take out your Haunter, and it will evolve.
you dont use a stone, you trade it to evolve it into a machamp
no sorry but if you want to evolve from a trade you could always use globle trade center
You actually need to trade it then it evolves 1!
trade it with something or you can use a moon stone on it.