Question: pokemon let's go pikachu what level does haunter evolve?
Answer: What level does Pokemon Let's Go Haunter Evolve at? The Unevolved Form Gastly Evolves at level 25 into Haunter, which then Evolves from Player (Trade) into Gengar. This pokemon also has a Mega Evolution in the form of Mega Gengar, which you can use in battle with a Mega Stone.