It was the third Pokémon she used in her Gym Battle against Ash. Despite its unimpressive appearance and limited moveset, Tynamo has proven itself to be a formidable opponent for Ash's Pokémon. Though its only known move is Tackle, the speed of which was capable of rivaling the speed of Ash's Pikachu.
But Pikachu used tons of Thunderbolts, which whipped Tynamo into a distress, causing it to charge. Pikachu defeated Tynamo using Iron Tail.