When Sableye attacked Maylene and her Riolu, Gastrodon gnawed on Candice's hand, preventing her from sending a Pokémon. Moreover, Gastrodon trapped Candice in mud by using Mud Bomb when Gastrodon encountered Platinum, Maylene and Candice while they were training in the snow. Gastrodon's trainer, Jupiter, revealed herself and ordered Gastrodon to use Mud Shot on Riolu when Maylene ordered her Riolu to help Candice. Mud Shot successfully hit Riolu and it was badly damaged by it. When Uxie emerged, Jupiter went to capture it. Candice sent her Froslass to attack her, but was knocked out by Gastrodon's Stone Edge. Platinum went to Snowpoint Temple with the unconscious Maylene and Candice, who were carried by her Rapidash, and admitted that Jupiter and her Pokémon were too powerful for them. Platinum remembered Jupiter's Gastrodon, and explained its defenses to Volkner.
At Spear Pillar, Cyrus went to conduct the final phase of the plan, Jupiter sensed someone behind her trying to sneak attack her, and had Gastrodon fire an attack at the Pokémon. In fact, Roark, Gardenia and Fantina arrived to stop them. Since more Gym Leaders started to gather, Jupiter faced Maylene and Candice. She sent Tangrowth, Sableye and Gastrodon against the duo's Pokémon.