While training in a forest, Torrcat and Lycanroc's attacks collide. This disturbs the Mythical Pokémon, Celebi, who causes Ash to time travel back many years to where Ash meets a young trainer and his Litten. Back in the present, Professor Burnet finds and old photo of Kukui as a child with his own Litten, which causes Kukui to reminisce. Will Ash manage to get back to his own time?

The group has gone to Lillie's house for training with their Z-Moves ahead of the Alola Pokémon League when Lillie shows the group the Magearna her father found for her. In addition to that, Gladion is on Melemele Island looking for something with hisUmbreon. Will he find what he's looking for and will Lillie finally master her Z-Move?