After Ash's Pikachu managed to defeat Elesa's Emolga, Elesa sent her Tynamo. Despite its unimpressive appearance and limited moveset, Tynamo has proven itself to be a formidable opponent, using its impressive speed to hit Pikachu. Pikachu used Thunderbolt on the ground, which whipped Tynamo into a distress, causing it to charge. Pikachu defeated Tynamo using Iron Tail, thus making Ash win the Gym match.
Ash remembered battling the Unova Gym Leaders, including Elesa and her Tynamo, the night before he entered the Unova League.