you can trade it at the guy at snowpoint city
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Gastly evolves to Haunter at level 25. Then, Haunter evolves into Gengar by being traded.
You will need to level up Haunter to level 50 to evolve it in Pokemon Resolute.
Gastly evolves into Haunter at level 25 and then into Gengar when you trade it to another game.
Haunter evolves through a trade.
you have to trade