you can't find haunter in Black
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You can't catch a Haunter in Emerald. You can trade for one, you can find a Duskull/Dusclops at MT Pyre, but you can't straight out find a wild Haunter.
Yes, Haunter is a very good Pokemon
You have to find your friend, you trade your Haunter with another Pokemon and when the trade is done Haunter will evolve.
You can't find gengar in the wild, you have to get a haunter and trade it.
You'll need to trade for a Haunter or a Gengar in the GTS or from someone.