Yes.
If you plug in a GBA Pokemon game into your DS then play your DS Pokemon game, you will find an evolved haunter (gengar) in the purple painting in the old chateau
You cant but u can find a trainer with a Haunter and trade it with a friend, then trade back and u have Gengar.
The pre-evolution of Haunter is Ghastly. To evolve Haunter you must trade it to Friend and have them trade it back.
Haunter does not evolve at a level! You had it right when you said "after Haunter is traded"! Haunter evolves into Gengar as soon as the trade is made! Unless it is holding an Everstone, of course. I am not sure what needs to happen when it is holding an Everstone while traded.
Ghastly to Haunter is 25. Haunter to Gengar you'll have to trade it with a friend.
In order to evolve Haunter, u have to trade and it will evolve into a Gengar.
you can't find haunter in Black
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.
look in the Pokemon tower in lavender for haunter. note, haunter is hard to find in the Pokemon tower
Haunter can be found on Route 8 or in the Safari Zone.
Yes. you can find ghastly at lost tower or Eterna Forest. You can get haunter but i don't know where.
you cant find gengar in any of the games im afraid, you must trade haunter and then you get gengar
You can find Haunter in SoulSilver in Route 8 at night. Additionally you can catch a Gastly at night in the Sprout Tower or the Bell Tower and then you can train it until Level 25 which is when it'll evolve into a Haunter.
you get it over a trade.
You have to find your friend, you trade your Haunter with another Pokemon and when the trade is done Haunter will evolve.
Trade a Haunter and it will evolve into gengar
you cant you have to evolve haunter
in the farm and outside the farm or forest