Marill got separated from Lyra and got stuck between walls. Ash and Dawn attempted to have Pikachu and Piplup pull it out, to which Marill used Water Gun to release itself. As Dawn's egg went missing, Lyra sent Marill, who fired Water Gun in mid-air. This let the other group - Ash, Brock and Khoury - know their location. It later used Water Gun to blast Team Rocket away and retrieve the egg. As the group was training, Marill went away, to the Valley Windworks. The group followed Marill inside the power plant, where Lyra eventually found Marill. As a Gible that the group wanted to catch escaped, Lyra had Marill trace its whereabouts, to a cave.