FusionDex.org

Nufing live near active volcanoes where the arid climate makes them feel comfortable. The smog that they release from their bodies is a dense toxic substance that kills grass on contact and leaves little place for herbivorous Pokémon.

Getting up close to a Nufing will give you a chance to observe, through its thin skin, the toxic gases swirling inside. A Nufing stores boiling magma in the hump on its back.