S21

When Ash sees the Legendary Pokémon Solgaleo and Lunala in a dream, he makes a promise to them. But when he wakes up, he can’t remember what it was! Will the strange Pokémon called Nebby help jog his memory? Along with their new friend and the rest of the students at the Pokémon School, Ash and Pikachu explore the Aether Foundation, an organization dedicated to Pokémon conservation and care. But it may not be as innocent as it seems, and Ash and his friends will have to work together to protect the people and Pokémon they care about as they face a mysterious power like nothing they have ever seen.

Spoiler warning: this article may contain major plot or ending details.

Poster for the season

• Ash finds and befriends a Cosmog, which Lillie nicknames Nebby. (SM044)
• Ash learns about the Aether Foundation and Ultra Beasts upon meeting Lusamine, Professor Burnet, Faba, and Wicke for the first time. (SM044)
• Ash learns that Lillie's fear of touching Pokémon is related to Nihilego. (SM047)
• Lillie becomes unable to touch any Pokémon again after encountering Gladion's Silvally. (SM048)
• Gladion's Silvally breaks free of its mask, revealing its true form. (SM049)
• Lillie remembers the incident that made her afraid of touching Pokémon and overcomes her fear, becoming able to touch all Pokémon once again. (SM049)
• Faba kidnaps Nebby, which then evolves into Cosmoem. (SM050)
• Faba summons a Nihilego, which takes Lusamine through an Ultra Wormhole. (SM050)
• Lillie changes her outfit into her "Z-Powered form". (SM051)
• Ash and his classmates travel to Poni Island with Professor Kukui, following Lillie and Gladion who are searching for a way to save Lusamine. (SM051 - SM054)
  • Ash obtains a Solganium Z, and the guardian deities upgrade Ash's Z-Ring into a Z-Power Ring. (SM052)
  • Ash, his classmates, and Gladion enter an Ultra Wormhole with Nebby, having evolved into Solgaleo, in search of Lusamine. (SM052 - SM054)
    • Ash, his classmates, and Gladion find Lusamine in Ultra Deep Sea, only to discover she has fused with Nihilego. (SM053)
    • Ash's Electrium Z temporarily changes into a Pikashunium Z allowing Ash and Pikachu perform 10,000,000 Volt Thunderbolt. (SM054)
    • Ash and Pikachu defeat Lusamine and free her from Nihilego's control, and return to their own world. (SM054)
• Nebby is revealed to have returned to the wild. (SM055)
• Professor Kukui proposes to Professor Burnet and get married. (SM055)
• Lusamine, Wicke, and Faba invite Ash and his classmates to join the "Ultra Guardians" task force to deal with any future Ultra Beast incidents, which they accept. (SM055)
• Ash visits Ula'ula Island for the first time. (SM060)
• Ash and his classmates go on their first Ultra Guardians mission, catching a Buzzwole and releasing it back into Ultra Space. (SM061)
• An Alolan Meowth joins Team Rocket and travels to the Team Rocket HQ in Kanto, where it is appointed as Matori's assistant. (SM062)
• Ash, the Masked Royal, Sophocles, and Kiawe participate in a Battle Royal and the Masked Royal wins. (SM063)
• Ash and his classmates go on their second Ultra Guardians mission, freeing a Celesteela and allowing it to fly back home. (SM069)
• Team Rocket receives a Z-Power Ring from Nanu, while Jessie receives a Mimikium Z from Acerola's Mimikins. (SM073)
• Professor Kukui is revealed to have told Ash and his classmates about the Pokémon League he's establishing in Alola. (SM074)
• Ash and his classmates go on their third Ultra Guardians mission, catching a Blacephalon and a Xurkitree, and releasing them back into Ultra Space. (SM078)
• Lillie receives an Icium Z from the newly evolved Alolan Sandslash. (SM080)
• Lillie offers an Ice Stone to Snowy, but it refuses to evolve for the time being. (SM080)
• Ash and his classmates go on their fourth Ultra Guardians mission, catching a Stakataka and releasing it back into Ultra Space. (SM085)
• A small Ultra Wormhole opens above the Altar of the Sunne, covering Alola with dark clouds and draining the region of its Ultra Aura, causing all adults to lose their energy and motivation, and draining Z-Moves of their power. (SM087)
• Gladion is revealed to have joined the Ultra Guardians and acquired a Z-Power Ring. (SM087)
• A special Team Rocket unit led by Matori called the "Matori Matrix", arrives in Alola on Giovanni's orders, but fails in its attempts to capture Necrozma, Nebby, and Lunala, and is forced to retreat. (SM087 - SM090)
• Ash and his classmates go on their fifth Ultra Guardians mission, traveling to the Altar of the Sunne and to Poipole's home world through an Ultra Wormhole. (SM087 - SM090)
  • Necrozma brings the light back to Poipole's home world, restoring it to its former state, and the Ultra Guardians, Nebby, and Lunala return to Alola. (SM090)

• This is the first season whose trailer is dubbed to Brazilian Portuguese[1] and Latin American Spanish[2].

• Pokémon the Series: Sun & Moon—Ultra Adventures page at Pokémon.com