In the anime, Wilma owns one Pokémon, Altaria, which knows Draco Meteor. Ash and friends met Wilma on their way to Daybreak Town. After helping save her Altaria from Team Rocket, she showed them the way to Daybreak Town. During her time alone, she also befriended a Gible. After it met Ash, it left Wilma and began following him.
Altaria was a Pokémon Wilma trained for a trainer to use Draco Meteor. As it succeeded, Team Rocket got it because it knew Draco Meteor. Nevertheless, Altaria was saved and given back to Wilma.