Gastly

Gastly, the Gas Pokémon, is a Ghost/Poison type introduced in Generation I. It is known for its ethereal, gaseous form and mischievous nature. Typically found in dark, abandoned places like old mansions, towers, and caves, Gastly uses its gaseous body to envelop and disorient its prey. Its diet consists of life energy, which it absorbs from living beings. Gastly evolves into Haunter starting at level 25, and then into Gengar when traded. In the games, Gastly is notable for being one of the original Ghost-type Pokémon, offering unique strategic options due to its type immunities. In the anime, Gastly often appears as a playful yet sometimes frightening specter, famously encountered in the Pokémon Tower in Lavender Town. Its spectral appearance and ability to phase through objects have made it a recognizable and iconic figure in the Pokémon universe, embodying the spooky and mysterious elements of the franchise.