Roxie caught Koffing while on tour in Kanto. Roxie used Koffing in the Gym match against Ash, who sent Boldore. Boldore started out with Sandstorm, though Koffing easily negated the move with Clear Smog, even its Rock Blast was negated by Koffing's Gyro Ball. Koffing attacked Boldore with Sludge Bomb, though Boldore countered the attack with Flash Cannon. Koffing repeated its Gyro Ball and Boldore tried to slow it down with Sandstorm. However, Boldore failed and got defeated. Ash called Boldore back and sent Unfezant, who started off with Quick Attack. Koffing tried to apply a burn to Unfezant with a Will-O-Wisp, but Unfezant gusted away the attack. Unfezant missed Koffing with Air Cutter and got poisoned by its Sludge Bomb. Koffing spread the smoke using Clear Smog. Unfezant used Aerial Ace, but the move was blocked by Koffing's Gyro Ball and Unfezant herself was defeated. Ash sent Leavanny, surprising Roxie, since Leavanny was vulnerable to poison. Leavanny hit Koffing with Energy Ball and stopped its Gyro Ball with String Shot. Koffing tried to hit Leavanny with Sludge Bomb, but was spinned around and was defeated by Leavanny's Energy Ball.
|Clear Smog||Rocking the Virbank Gym! (Part 1)|
|Gyro Ball||Rocking the Virbank Gym! (Part 1)|
|Will-O-Wisp||Rocking the Virbank Gym! (Part 1)|
|Sludge Bomb||Rocking the Virbank Gym! (Part 1)|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.