No, you don't need the National Dex to evolve Haunter in Pokemon SoulSilver. You just need to trade it with a friend then trade it back. Then, you have a Gengar!
In order to evolve Haunter, u have to trade and it will evolve into a Gengar.
The pre-evolution of Haunter is Ghastly. To evolve Haunter you must trade it to Friend and have them trade it back.
To evolve haunter u have to trade it. As soon as it is traded it will evolve into Gengar.
just when gastly evolves into haunter it dosent matter what level you trade it it will evolve
Haunter doesn't evolve at any level to evolve your haunter you need to do a link trade with a friend and he he will then evolve
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.
OF COURSE!! you'll need to trade an haunter to a friend, and haunter will evolve TO GENGAR
You'll need to trade for a Haunter in order for it to evolve into Gengar.
None!
If you just trade the haunter with no items it will evolve to gengar now take it back so that you have the gengar. You can't evolve a haunter by migrating it.
In Pokémon Mysery Dungeon: Red Rescue Team, you will first need to have only Haunter in your rescue party in order for it to evolve and then you will need to head to Luminous Cave and as long as you have the Link Cable item in your bag then Haunter will evolve.
There is no specific Pokémon that you need to trade Haunter for in order to evolve it.
You will need to level up Haunter to level 50 to evolve it in Pokemon Resolute.
Graveler does not use an item to evolve. It evolves by being traded to someone else, meaning that you will need at least two game cartridges and consoles and a way to link them together. The same goes for Haunter, Machoke, and Kadabra.
Evolve Ghastly. Ghastly can be found at White Forest. Evolve it into Haunter at level 25 and then evolve Haunter into Gengar by trading Haunter.
You don't need a stone you need to trade it to someone then trade it back to you and it will evolve!