Whitney (anime)

Whitney is a Gym Leader appearing in Pokémon: Johto League Champions.

Season 4: Johto League Champions
Whitney first appeared when Ash, Misty and Brock were lost in Goldenrod City. At first glance Whitney is a kind girl, but she can be klutzy and ditzy sometimes, getting lost in her own town as an example. However, in battle she is quite formidable, especially with her Miltank.

Season 5: Master Quest
When Team Rocket stole Ash's badges, Ash remembered his fights with the Johto Gym Leaders, as his Pokémon were responsible for winning those badges.