Haunter

Haunter is a Ghost/Poison-type Pokémon introduced in Generation I, evolving from Gastly at Level 25 and evolving into Gengar when traded. Known as the Gas Pokémon, Haunter is a mischievous and ethereal entity that drifts silently through the air. Its body is composed of a gaseous substance, allowing it to pass through solid objects and vanish at will. Haunter is notorious for its love of pranks, often startling its victims by licking them, which causes a chilling paralysis that lasts until the victim's life fades away. Despite its eerie nature, Haunter is often depicted with a playful, if somewhat sinister, grin. It typically inhabits dark and desolate places like old mansions, cemeteries, and caves, where it can easily hide and ambush unsuspecting travelers. In the anime, Haunter famously befriended Ash Ketchum for a short period, helping him defeat Sabrina’s powerful Psychic-type Pokémon with its unique brand of humor and mischief, showcasing a more complex personality than its Pokédex entries might suggest. Its ability to detach its hands and float them independently adds to its spectral and unsettling appearance, cementing its status as one of the most iconic Ghost-type Pokémon.