Lillie — Pokémon Sun and Moon

Lillie grew up at Aether Paradise with her mother, Aether Foundation president Lusamine, and her older brother Gladion. Her father disappeared during Ultra Wormhole research, and Lusamine became increasingly controlling of her children. Gladion left home before Lillie did. When Lillie discovered that the Foundation’s Ultra Wormhole experiments could fatally strain a Cosmog, she took the Pokémon, named it Nebby, and fled Aether Paradise. Wicke knew of her plan and directed her toward Professor Burnet, whose help led to shelter with Professor Kukui.

Lillie keeps Nebby hidden because the Foundation has the means to reclaim it. As someone who does not battle, she depends on discretion and the help of people she trusts. That leaves her in an uneasy position: protecting Nebby means resisting an organization headed by her own mother.

Team Skull takes Lillie and Nebby back to Aether Paradise while the player is away. Gladion leads the player and Hau to the facility, where the truth about Lillie’s family and the Foundation’s experiments emerges. Lusamine forcibly uses Nebby’s power to open Ultra Wormholes, and the exhausted Cosmog changes into Cosmoem. Lusamine then enters Ultra Space with Guzma.

Lillie is hurt by her mother’s treatment of both children and Pokémon, but her response is not to abandon hope. She recognizes that remaining silent would put others at risk and chooses to take a more active part in Nebby’s rescue.

Lillie changes her hairstyle and clothing into a look she calls her “Z-Powered form,” a choice that marks her determination to help Nebby and Lusamine. She accompanies the player to Poni Island and learns how the ceremonial flutes can awaken Nebby’s power. In Vast Poni Canyon, she crosses a narrow bridge on her own despite her fear of heights—a pointed contrast with their first meeting on Mahalo Trail. At the altar, she and the player play the flutes, and Nebby becomes Solgaleo in Pokémon Sun or Lunala in Pokémon Moon, opening the way into Ultra Space.

Inside Ultra Space, Lillie confronts Lusamine directly and rejects her mother’s attempts to control her. Lusamine has fused with Nihilego, but after the player defeats her, Nebby’s intervention separates them. Lillie’s resolve matters here because she finally speaks for herself while continuing to hope for her mother’s recovery.

Lillie decides that Nebby should accompany the player as a Pokémon partner, despite how much she loves it. After the player becomes Alola’s first Champion, she returns to celebrate and visits the Ruins of Conflict with the player to thank Tapu Koko. The next day, she leaves Alola for Kanto, hoping to help Lusamine recover and learn to become a Trainer in her own right. She gives the player her cherished Poké Doll before departing by ship.

In the postgame, Wicke explains that Lillie intends to seek out Bill, who once experienced fusion with a Pokémon and might be able to help Lusamine. The original games end with Lillie leaving on that journey; they do not show her completing treatment or definitively resolving her mother’s condition.

Pokémon Ultra Sun and Ultra Moon alter the conflict involving Lusamine, Nebby, and Necrozma. In this alternate version of the Alola story, Lillie stays involved after the main adventure and becomes a Pokémon Trainer; she helps the player during Episode RR and may later battle alongside them in the Battle Tree. This is an outcome of those games, not a subsequent chapter that should be pasted onto the Kanto departure ending of the original Sun and Moon.