Haunter

Haunter, the Gas Pokémon, is a Ghost/Poison-type from the first generation, introduced in Pokémon Red and Blue. It evolves from Gastly starting at level 25 and then evolves into Gengar when traded. Known for its mischievous and often terrifying antics, Haunter delights in scaring people and Pokémon alike, sometimes even licking them to drain their life force. Its ethereal form allows it to glide through walls and solid objects, making it notoriously difficult to escape. Haunter is often depicted in dark, abandoned places like old mansions or cemeteries, adding to its spooky allure. In the anime, Ash's Haunter provided comic relief and eventually helped defeat Sabrina's powerful psychic Pokémon. Its evolution line, particularly Gengar, holds significant cultural weight as one of the original and most iconic Ghost-type Pokémon, representing the darker, mysterious side of the Pokémon world. Its unique typing gives it resistances to Grass and Poison, but also weaknesses to Psychic and Ground.