Koffing is a Poison-type Pokémon that was introduced in Generation I of the Pokémon franchise. It is known for its spherical shape and the toxic gas it releases from its body, which can be harmful to other Pokémon and trainers.

In the Pokémon games, Koffing is often found in caves, abandoned buildings, or other areas with poor air quality. It is capable of using a variety of Poison-type moves, such as Poison Gas and Sludge Bomb, to damage its opponents. Koffing can evolve into Weezing starting at level 35.

In the Pokémon anime, Koffing has made several appearances as a wild Pokémon or as one of the companion Pokémon of a villainous character. It is often shown using its toxic gas to hinder the efforts of the protagonists.

Overall, Koffing has become a recognizable and popular Pokémon among fans of the series, and its unique appearance and Poison-type abilities have made it a popular choice for merchandise and media appearances.