Haunter evolves into Gengar by trading. Since the GTS is not functional in Pokemon Diamond and Pearl anymore, you will need to ask a friend, who has a copy, to do a trade-back with your Haunter.
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Pokemon diamond & pearl
None yet. POKEMON PLATINUM, it is out in Jp
it doesnt.....unless pokemon brings up the next pokemon and shows steelix's evolution
You have to trade Gurdurr to get the next evolution.
It was supposed to be the sequel to Diamond and Pearl, but was replaced with Pokemon Platinum. it wasnt the next sequel and there is no Pokemon opal