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.
you cant find gengar in any of the games im afraid, you must trade haunter and then you get gengar
Yes. you can find ghastly at lost tower or Eterna Forest. You can get haunter but i don't know where.
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