no level you have to trade dude
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You will need to level up Haunter to level 50 to evolve it in Pokemon Resolute.
Haunter evolves through a trade.
you have to trade
Haunter will evolve into Gengar when it is traded. It doesn't matter what level it is, just trade it with someone and when they get it it will evolve into Gengar, then get them to trade it back to you.
You have to trade the Haunter to evolve. I learned the hard way. It got to level 59 and I traded..... it evolved!