In the Pokmon video game series, Haunter is a Ghost/Poison-type Pokmon that evolves into Gengar. Haunter can be evolved into Gengar by trading it to another player while it is holding a Reaper Cloth.
Evolving Haunter into Gengar is important because Gengar is a powerful Pokmon with high Special Attack and Speed stats. It is also one of the few Pokmon that can learn the move Shadow Ball, which is a powerful Ghost-type move.
