Haunter

Haunter, the Gas Pokémon, is a spectral being known for its eerie presence and mischievous nature. Introduced in the first generation of Pokémon, it evolves from Gastly and can further evolve into Gengar when traded. This Ghost/Poison type Pokémon is often found in dark, abandoned places like old mansions, caves, and graveyards, where it delights in frightening people and absorbing their life force. Its gaseous body allows it to float silently through walls and other obstacles, making it an elusive and unsettling encounter. In the games, Haunter is a formidable opponent, often inflicting status conditions like Poison and Confusion. In the anime, it's famously known for its playful yet spooky personality, particularly the one that befriended Ash in Lavender Town. Its iconic design, with its disembodied hands and menacing grin, has solidified its place as one of the most recognizable and beloved Ghost-type Pokémon, embodying the spooky and mysterious side of the Pokémon world. Its unique type combination provides interesting matchups, being weak to Psychic and Ground, while resisting Grass, Poison, Bug, and Fairy, and being immune to Normal and Fighting type moves.