Because it stores several kinds of toxic gases in its body, Koffing is prone to exploding without warning. In Ash’s first adventure, “Pokémon Emergency,” Pikachu is rushed to the Viridian City Pokémon Center to be treated for severe exhaustion. When the evil Team Rocket show up, the pair send Ekans and the toxic Koffing to destroy the center. The barely recovered Pikachu and other Pokémon from the center join forces to defeat the Pokémon-snatching villains.
First appearance: Episode 2—”Pokémon Emergency”
