Koffing is a Poison-type Pokémon introduced in Generation I.
It evolves into Weezing starting at level 35.
In Galar, Koffing evolves into Galarian Weezing starting at level 35.
Koffing creates gases within its body by mixing toxins with garbage, and produces more gas in higher temperatures. These gases are malodorous and cause sniffles, coughs, and teary eyes to those around them. The gases are also lighter than air, allowing Koffing to hover. When agitated, it creates a more toxic gas and expels it through the holes in its body. As shown in the anime, Koffing's gas can be ignited by fire or electricity. It feeds on the fumes of raw, rotting trash found in gas dumps and polluted air. Koffing at one point was plentiful in Galar due to factories. Koffing is most often found in urban areas.