Haunter is a Ghost/Poison-type Pokémon introduced in Generation I. It evolves from Gastly and can further evolve into Gengar when traded. Haunter is known for its floating, shadowy form and its ability to pass through walls, making it a spooky presence in the Pokémon world. In battles, Haunter uses a variety of moves, including Shadow Ball and Hypnosis. Its unique typing gives it strengths against Psychic and Fairy types, while being vulnerable to Dark and Ghost moves. Haunter is often depicted as mischievous, playing tricks on unsuspecting trainers and Pokémon alike.