Smogon

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The Pokémon’s story

Koffing floats thanks to the light gases accumulated inside its body. It frequents rubbish dumps, attracted by decaying waste, then mixes toxins and refuse to produce a dangerous gas. When it becomes agitated, toxicity increases and it may expel the mixture through openings in its body. Heat makes these contents unstable, to the point of causing an explosion. Its round silhouette therefore conceals a fragile balance between what it swallows, the temperature and the gases keeping it aloft.

A detail worth noticing

Pokémon Alpha Sapphire states that the warmer the air, the more gas Koffing produces. Pokémon: Let’s Go, Pikachu! warns that this heat can also make its body unstable and cause an explosion. The danger does not come solely from its toxicity.