Whitney's Clefairy was one of Whitney's Fairy-type (formerly Normal) Pokémon, who was often seen out of its Poké Ball.
Ash and co. first met Whitney when Ash's Pikachu bumped into her Clefairy. It later became a target of Team Rocket and was almost captured, along with Pikachu. However, using its Metronome move, it was able to whip up a strong Gust attack to blow away Team Rocket. Clefairy was used in Ash's Gym Battle against Whitney and was the second Pokémon she used. Luck, however, was not on Clefairy's side after it used Metronome and it came up with a measly Splash attack, and forfeited after getting scared from an intense Flamethrower attack from Ash's Cyndaquil.