Haunter does not evlove unlest traded or you mirate a gengar form your older game pack to get a genger I hope this information was useful for you.
You have to trade to evolve him
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There is no level, in order for him to evolve you MUST trade him.
Haunter does NOT evolve by level. You evolve Haunter by trading it with a friend, and then they trade it back to you. Hope I helped :)Haunter evolves from Gastly at level 25.Haunter evolves into Gengar through trade.Haunter evolves into Gengar by trading it.
Haunter doesn't evolve at a level. It evolves by trading with another trainer.
Gastly evolves to Haunter at lv25. And Haunter evolves to Gengar after trading.
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.