Chapter Summaries

At Horizon Gym, the Masked Royal faced Island Kahuna Hala in the opening match of the Alola Region's Master League Points Tournament. The Masked Royal won after Incineroar defeated Hala's final Pokémon, Hariyama.

• Li Wei brought Ash, Kiawe, Lillie, and the others to watch the opening match, while Ash wondered why Professor Kukui had not arrived.
• The Masked Royal and Hala sent out Incineroar and Hariyama, and their Pokémon exchanged powerful attacks before the Masked Royal recalled Incineroar.
• Primarina and Bewear knocked each other out, then Crabominable defeated Decidueye before Incineroar knocked Crabominable out with Flame Charge.
• The Masked Royal and Hala used their Z-Moves, Malicious Moonsault and All-Out Pummeling, which collided and left Incineroar and Hariyama badly injured.
• Incineroar struck Hariyama with Darkest Lariat before Hariyama could use Reversal, giving the Masked Royal the victory.

Ash prepared to make his Master League Points Tournament debut against Kahili while battles unfolded in the Alola Division and the Midseason Championship. The chapter ended with Ash and Pikachu moments away from entering the arena.

• Professor Kukui, disguised as the Masked Royal, defeated Hala 3-2, then treated Incineroar and returned to Ash after missing two matches.
• At the Indigo Plateau Midseason Championship, Roland surprised the competitors by defeating Wallace after four months of training with Red and Blue.
• Li Wei overwhelmed his opponent with his Dragon-types, while Ash prepared to face Kahili in his Master League debut.
• Mallow cheered for Ash, while Lana considered cheering for Kahili too and Li Wei told her to support both competitors.
• In the Competitor Tunnel, Ash told Pikachu that his Master League debut was finally here, and Pikachu answered eagerly.

Ash made his Master League debut against Kahili, defeating her first two Pokémon and bringing out Charizard against her last. The battle continued with Charizard facing Kahili’s Pom-Pom Style Oricorio.

• Ash and Kahili began their three-on-three match in a forest arena, with Ash choosing Pikachu and Kahili choosing Hawlucha.
• Pikachu defeated Hawlucha with Volt Tackle, and Kahili sent out her Fire- and Flying-type Oricorio.
• Ash switched to Greninja, activated Ash-Greninja, and defeated Oricorio with Double Team, Water Shuriken, and Surf.
• Kahili sent out her Electric- and Flying-type Pom-Pom Style Oricorio, and Ash used U-turn to switch Greninja for Charizard.
• Charizard dodged Oricorio’s Discharge and answered with Flamethrower.

Ash won his Master League debut with a 3-0 shutout, then Pokémon School began its twentieth-anniversary trip to Kanto. After the students arrived, Brock helped Lillie when Snowy became airsick, and Crystal greeted the group at the airport.

• Ash defeated his opponent with Flamethrower, winning his Master League debut and impressing the spectators.
• Principal Oak announced that Pokémon School would celebrate its twentieth anniversary with a trip to Kanto, including a visit to Professor Oak's Laboratory and the Master League Midseason Championship.
• Li Wei traveled to Kanto ahead of the students, while Ash became excited about watching the championship.
• After the group landed in Kanto, Snowy felt airsick, so Brock examined her and offered to carry Lillie's suitcase.
• Brock ignored Ash to flirt with a flight attendant until Croagunk stopped him, and Crystal introduced herself as Professor Oak's assistant and welcomed the students.

Ash returned to Professor Oak's Laboratory with his friends, where he reunited with Professor Oak and explored the vast Pokémon sanctuary. His Pokémon welcomed him with an enthusiastic charge, and more familiar companions gathered around him.

• Crystal and Brock drove Ash and the others back to Professor Oak's Laboratory, where Li Wei had arrived earlier and Professor Oak warmly greeted Principal Oak.
• Li Wei, Professor Kukui, Professor Oak, and Principal Oak discussed plans to raise Hisui Goodra and study Dusk Form Lycanroc at three experimental sites.
• Brock and Christa guided Ash and his classmates through the laboratory's sprawling backyard, where they admired the landscape and its many Pokémon.
• Ash called out to the Pokémon, and his Tauros herd charged over and launched him into the air as Pikachu ran away.
• Bayleef affectionately knocked Ash onto the grass, Talonflame landed beside him, and Torterra approached with several Pokémon riding on its back.

Ash reunited with the Pokémon staying at Professor Oak's Laboratory and showed his classmates around the Backyard, where they met and played with many Pokémon. Brock ended the visit by comparing Kanto and Alola Exeggutor.

• Ash returned to Professor Oak's Laboratory, where Crystal and his Pokémon welcomed him back.
• Crystal told Ash's classmates they could explore the Backyard but should avoid Back Mountain, where Red's and Blue's Pokémon were battling.
• Kiawe raced Rapidash on Charizard, then rode Rapidash, while Lana fished and Mallow found Shaymin and Victini playing hide-and-seek.
• Sophocles met Raichu, and Lillie watched Ninetales accept Snowy and groom her among a group of Vulpix.
• Ash and his classmates gathered to watch Dewgong perform with Popplio's bubble, while Pokédex Rotom collected Pokémon data.
• Brock introduced a Kanto Exeggutor and an Alola Exeggutor, prompting the group to compare their heights.

Brock’s outdoor lesson led to a commotion between two Marowak, and Alolan Marowak and Popplio went missing. While searching the Back Mountain, Ash and the others found Pikachu’s Kangaskhan mother, and Pikachu reunited with her before the search continued.

• Brock showed the group Kanto and Alolan Pokémon, and Kiawe’s Alolan Marowak clashed with Kanto’s Marowak until Pikachu’s Thunderbolt stopped the ensuing commotion.
• Kiawe discovered that Alolan Marowak was missing, and Lana realized Popplio was gone too, so the group split up to search Professor Oak’s Backyard.
• After none of the Pokémon in the front yard had seen them, Ash and the others headed into the Back Mountain and saw Blue’s powerful Machamp, Gyarados, and Aerodactyl.
• Crystal asked Aerodactyl for help, and Aerodactyl indicated a direction for the group to follow.
• Pikachu spotted the Kangaskhan mother who had raised them as a Pichu and ran to embrace her while Crystal told the others their story.
• Pikachu said goodbye to their Kangaskhan mother for now, promising to return that night, and the group continued looking for Popplio and Marowak.

Ash and his classmates searched Back Mountain for Popplio and Marowak, with help from Mew and Blue’s Arcanine, while Li Wei and the professors discussed Rockruff and Eevee research. The group ended the day with plans to explore Grand Sableye Canyon for fossils the next day.

• Ash and his classmates encountered Mew, who agreed to help them search for Popplio and Marowak.
• Blue’s Arcanine led the group to Marowak, who was challenging Onix, and Lana found Popplio while Kiawe carried Marowak back.
• Li Wei and the professors discussed raising Goomy, identifying Special Rockruff, and the possibility of undiscovered Eevee evolutions.
• Professor Oak, Li Wei, and Professor Kukui planned a study outing to Grand Sableye Canyon to excavate fossils.
• Li Wei asked Mallow to learn a new Pokémon Curry recipe and assigned Ash, Lana, and Lillie to help prepare.

Li Wei, Brock, Professor Kukui, and the students toured Pewter City’s Gym and fossil museum, where they learned about ancient Pokémon and the science of reviving them. Professor Kukui explained that revived Pokémon were new individuals, though some retained memories of ancient times.

• Brock showed the group Pewter City’s colorful buildings and explained that he had once been the Pewter Gym Leader before handing the Gym to his younger brother, Jiro.
• Li Wei and Brock took the group to watch Jiro defeat a novice Trainer’s Rattata with Larvitar at the Gym.
• The group visited Pewter City’s Fossil Museum, where Professor Kukui explained how fossils revealed the lives of extinct Pokémon.
• Li Wei identified fossils of Kabuto and Omanyte and explained that amber could preserve genetic material from ancient Pokémon such as Anorith.
• Professor Kukui told Lillie that some revived Pokémon remembered ancient times, while others did not, and that each revived Pokémon was a new individual with an ancient bloodline.

Li Wei and Professor Kukui taught Ash and the others about fossils before taking them to Grand Sableye Canyon for an excavation lesson. Kiawe used his experience to find a Kabuto's Armor Fossil and a Dracozolt fossil.

• The group explored the Fossil Museum, where Li Wei explained how Pokémon and their environments had evolved over time.
• Professor Kukui took the group to Grand Sableye Canyon and taught them how to locate, expose, and clean fossils safely.
• Kiawe applied what he had learned from his grandfather and the instructors to identify a promising crack in the rock.
• Kiawe carefully excavated a Kabuto's Armor Fossil and then found a Dracozolt fossil nearby.

At Grand Sableye Canyon, Kiawe found a rare Dracozolt fossil, while Sophocles used his research skills to locate amber. On the way back to Alola, Li Wei offered to take Mallow as an apprentice and bring her to Jubilife City to study cooking.

• Kiawe found a Dracozolt fossil, and researchers confirmed it could be revived before returning it to him.
• Sophocles used geological maps and excavation records to find amber, while Ash dug up fossilized droppings and the others found nothing.
• Kiawe discussed his many possible ambitions, and Li Wei encouraged him to pursue them all.
• Mallow shared her dream of taking over Aina's Kitchen and becoming a professional chef.
• Li Wei offered to teach Mallow cooking as his apprentice in Jubilife City, and Mallow eagerly accepted.
• The group boarded a flight back to Alola after their visit to Grand Sableye Canyon.

Mallow told her father and Ulu that Li Wei had offered to train her in cooking and Pokémon Food in Sinnoh, and they supported her plans. Meanwhile, Ash dreamed at the Altar of the Sunne, where Solgaleo and Lunala entrusted something to him.

• Mallow asked her father and Ulu for permission to study with Li Wei in Jubilife City after his work in Alola was finished.
• Mallow's father and Ulu tearfully reacted to her future departure, then gave her their wholehearted support.
• Ulu praised Li Wei's cooking and Pokémon Curry, citing the high regard of his teacher, Alain.
• Ash fell asleep at Professor Kukui's house and dreamed that Pikachu led him up to the Altar of the Sunne.
• Solgaleo and Lunala emerged from Ultra Wormholes and telepathically told Ash, “We're entrusting it to you, Ash.”

Solgaleo and Lunala entrusted Cosmog to Ash in a dream, and the Alola guardian deities sensed Cosmog's arrival. The next morning, Tapu Koko led Ash and Pikachu into the forest, where they found a Pokémon asleep on the ground.

• Solgaleo and Lunala entrusted Cosmog to Ash before returning through Ultra Wormholes, and Cosmog appeared at the Altar of the Sunne.
• Tapu Koko, Tapu Lele, Tapu Bulu, and Tapu Fini sensed the summons and the appearance of an Ultra Beast; Lucario, Zeraora, Li Wei, and Gladion also reacted to the disturbance.
• Ash woke late for school and learned from the morning news that Professor Burnet had won the Alola Woman of the Year Award and researched Ultra Wormholes.
• Professor Burnet, Lusamine, and Faba investigated the Altar of the Sunne after Aether Paradise recorded an unprecedented Ultra Aura spike there.
• Tapu Koko led Ash and Pikachu into the forest, where they found a Pokémon sleeping on the ground.

Ash found a sleeping, unknown Pokémon in the forest after Tapu Koko entrusted it to him, and brought it to the Pokémon School. The group named it Nebby, and the chapter ended with the Pokémon waking briefly before crying from hunger.

• Ash found a sleeping purple Pokémon in the forest, remembered a promise to find and care for it, and carried it to school.
• Professor Kukui and the students gathered to examine the Pokémon, but no one except Li Wei recognized what it was.
• Lillie suggested the name Nebby, and Ash, Li Wei, Professor Kukui, Principal Oak, and the others agreed.
• Nebby briefly opened its golden eyes, then began crying, and Li Wei realized it was hungry.

Li Wei helped Cosmog settle in with Pokéblocks and left it in Ash’s care. After Aether Paradise detected ultra energy near Melemele Island, Lusamine and her colleagues arrived at Professor Kukui’s house, where Lillie reunited with her mother and the two began arguing.

• Li Wei gave the crying Cosmog Pokéblocks, and Cosmog also showed interest in Sophocles’s Konpeitō.
• Lusamine ordered Professor Burnet, Wicke, and Faba to investigate ultra energy detected near Melemele Island.
• Professor Kukui hurried home to prepare for Lusamine’s visit after Professor Burnet told him they were coming.
• Lillie, Ash, and Sophocles bought Konpeitō, then returned to Professor Kukui’s house and found Lusamine waiting there.
• Lusamine hugged Lillie, and they began arguing about Clefairy evolving into Clefable.
• Professor Kukui introduced Professor Burnet, Wicke, and Faba to Ash and the others.

The Aether Foundation visited Professor Kukui’s house to learn about Cosmog, and Professor Burnet explained that it was likely an Ultra Beast. After Ash described his dream of Solgaleo and Lunala, Lusamine agreed to leave Cosmog in his care, with Li Wei offering to keep an eye on things.

• Professor Burnet showed Ash and the others images of the Altar of the Sunne and explained that Cosmog was likely an Ultra Beast.
• Ash recognized the Altar from his dream and said Solgaleo and Lunala had appeared there before Cosmog.
• Li Wei arrived at Professor Kukui’s invitation and backed Ash when Faba questioned whether a child could care for Cosmog.
• Lillie and Professor Kukui described Ash’s achievements and his connection to Tapu Koko, while Wicke looked up his record.
• Lusamine entrusted Cosmog to Ash and asked him to contact the Aether Foundation if he ran into trouble.

Lusamine entrusted Cosmog to Ash after learning about his League victories and history of surviving major incidents alongside Li Wei. Back at Professor Kukui’s house, Li Wei suggested that Aether Foundation could not have taken Cosmog away anyway.

• Li Wei reminded Lusamine that Ash’s experience with Legendary Pokémon and extraordinary incidents could make him a safer caretaker for Cosmog than a laboratory.
• Lusamine agreed to let Ash care for Cosmog, and Lillie offered to help.
• Lusamine, Professor Burnet, Wicke, and Faba left for Aether Foundation while Lillie stayed for dinner with Ash and James.
• On the helicopter, Wicke showed Lusamine and Professor Burnet records of Ash’s League wins and major incidents involving Legendary Pokémon, convincing them that Solgaleo and Lunala had chosen him for a reason.
• At Professor Kukui’s house, Li Wei made dinner and said that the others could not have taken Cosmog away.

Ash and his friends visited Aether Paradise, where Lusamine and Wicke showed them the foundation’s Pokémon conservation facilities. Meanwhile, Li Wei and Professor Kukui learned about the foundation’s Ultra Wormhole research, which had identified several Ultra Beasts and was developing warning systems to protect Alola.

• Lusamine invited Ash and his friends to Aether Paradise so they could learn about the organization and examine Cosmog.
• Wicke welcomed the visitors and explained that Aether Paradise treated injured Pokémon and housed research facilities.
• Lusamine hosted a welcome banquet, then Wicke guided Ash, Mallow, Lana, and Lillie through the conservation area.
• Ash compared Aether Paradise’s high-tech facilities with Li Wei’s Pokémon Theme Park, and the girls said they wanted to visit the park.
• Li Wei, Professor Kukui, Professor Burnet, and Faba discussed the foundation’s research into Ultra Wormholes and the Ultra Beasts shown in the Altar of the Sunne murals.
• Professor Burnet presented energy data for several Ultra Beasts, while Faba said the team was developing early-warning systems and response plans for Alola.

Li Wei, Ash, Kukui, and Aether Foundation researchers discussed Ultra Wormholes and how to prepare for Ultra Beasts. Li Wei recommended Lance to help, and the researchers concluded that Cosmog was similar to Pokémon despite coming from another world.

• Lusamine and Professor Burnet presented their Ultra Beast research and discussed Ash's dream and the possibility that some Ultra Beasts did not need to be repelled.
• Professor Burnet theorized that powerful energy could attract or open Ultra Wormholes, while Li Wei recognized that Cosmog's energy might draw other visitors from Ultra Space.
• Kukui stressed the need to prepare Alola's residents, and Li Wei recommended Lance to help with the response.
• Burnet, Faba, and Wicke examined Cosmog and found its Ultra Aura energy normal, concluding that creatures from other worlds were much like Pokémon but could still pose a danger.
• Li Wei, Ash, and the others left Aether Paradise and returned toward Melemele Island.

Ash met Gladion at Ten Carat Hill and learned why Lillie had become afraid of Pokémon, while Gladion discovered that Ash and Li Wei viewed Ultra Beasts differently. Gladion was left shaken after Ash revealed that Tapu Koko had brought Cosmog to him.

• Cosmog teleported Ash, Pikachu, and Lycanroc (Dusk Form) to Ten Carat Hill, where Ash reunited with Gladion and showed him Lycanroc’s new form.
• Gladion introduced Ash to Silvally, which recognized Cosmog as an Ultra Beast and took a battle stance before Gladion calmed it.
• Ash encouraged Gladion to visit Lillie and told him she could now touch Snowy and Pikachu and ride a Stoutland.
• Gladion explained that Nihilego had attacked Lillie, leaving her traumatized, and that Silvally had protected them; Lillie remembered none of the incident.
• Gladion warned Ash that Ultra Beasts brought disaster, but Ash cited Li Wei’s view that each Ultra Beast was an individual and said Solgaleo, Lunala, and Tapu Koko had entrusted Cosmog to him.
• Gladion was stunned to learn that Tapu Koko had brought an Ultra Beast to Ash.