You first catch a medicam. You then fly to Snowpoint city. Go north east of the gym . there is a house. Go to the blonde hair girl she will trade hauter for medicam
To evolve haunter u have to trade it. As soon as it is traded it will evolve into Gengar.
catch a haunter and trade it to someone then it will evolve but remember to ask them to trade it back
you can't find haunter in Black
There is no 'platnium', but you can find it on wild pokemon.
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
No, you'll have to trade it from Platnium. Which in Platnium you find it in the Rock Peak Ruins.
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.