Chapter Summaries

Diantha and Seiya defeated Drasna and two Gym Leaders at the Battle Chateau, earning Diantha a rapid promotion and spreading word of Seiya’s strength. Later, Diantha brought Seiya to Desert City for a swimsuit photo shoot, where the crew asked him to evolve into Vaporeon for water-themed photos.

• Diantha’s Seiya defeated Drasna’s Mega Florges in a decisive battle, and Drasna congratulated Diantha on her growing strength.
• Seiya beat Gym Leaders Violet and Chakuro in succession, giving Diantha three victories and earning her promotion to Battle Duke.
• Battle Chateau trainers spread news across Kalos that Diantha had caught the region’s mysterious, powerful Eevee.
• Diantha and Seiya traveled to Desert City for a promotional photo shoot featuring Diantha and her Pokémon.
• The director asked Diantha to have Seiya evolve into Vaporeon for photos playing together in the water, and Diantha noted that Mega Vaporeon would be too large for her to hold.

Diantha and Seiya completed a photoshoot in Desert City, where Ash, Serena, and the others joined them for a meal. When a mysterious ring appeared and Seiya chased a hand reaching for a donut into it, the portal vanished, leaving Diantha afraid he might not return.

• Diantha worried Seiya would refuse to let her ride on his back for the photoshoot, but Seiya used Telepathy to agree to help.
• Diantha and Seiya posed for photos, including shots of her riding Mega Vaporeon Seiya.
• Diantha thanked Seiya and Sableye, then reunited with Ash, Serena, and the others at the resort and invited them to eat.
• Serena's Sylveon came out of its Poké Ball to greet Seiya, who shared a donut with her.
• A mysterious ring appeared as Seiya reached for the last donut, and he leaped through it after grabbing the hand reaching for the food.
• The ring vanished, and Diantha worried Seiya might leave and never return while Ash and the others offered to help find him.

Seiya recognized Hoopa as the Pokémon that had stolen his doughnut and asked it to summon a powerful opponent for him to fight. Mairin stopped Hoopa and, after learning Seiya could speak through Telepathy, refused to let Hoopa help, hinting at its past.

• Seiya identified Hoopa and asked it to find him a strong opponent in exchange for more food.
• Mairin arrived with snacks, apologized for Hoopa stealing Seiya's doughnut, and tried to stop a fight.
• Hoopa told Mairin that Seiya had requested an opponent, and Seiya confirmed this to her through Telepathy.
• Mairin examined Seiya, asked whether she could catch him, then apologized after he objected to being handled.
• Seiya renewed his request for Hoopa's help, but Mairin refused and asked whether he knew how Hoopa had become this way.

Mairin told Seiya and the others how Hoopa’s power had once been sealed, but Balza opened the weakening Vessel of Retribution and its evil power began transforming Hoopa. Seiya forced the power back into the vessel, only for the seal to crack, leaving Diantha to call for an evacuation and League support.

• Mairin refused Seiya’s request to have Hoopa summon Legendary Pokémon, warning that he risked resembling Hoopa in the past.
• Diantha, Ash, and the others found Seiya, and Mairin explained Hoopa’s origins after they mistook her for a kidnapper.
• Balza arrived with the Vessel of Retribution, whose power had already influenced his mind, and opened it in front of everyone.
• The Vessel’s black smoke engulfed Hoopa and began changing its form, so Seiya transformed into Espeon and controlled Balza to draw the power back inside.
• After Balza replaced the lid, the Vessel of Retribution developed a web of cracks, and Diantha contacted the Kalos League to arrange an evacuation and send reinforcements.

After the Vessel of Retribution shattered, Hoopa expelled the evil power inside him, which became a second Unbound Hoopa and tried to capture him. Seiya stayed behind to protect the others, revealing his Mega Umbreon and Mega Glaceon forms, but Unbound Hoopa began breaking free of the ice.

• The Vessel of Retribution shattered, and Balza and Mairin helped Hoopa force the evil power out of his body.
• The expelled power transformed into a gigantic Unbound Hoopa and attacked Seiya and the others.
• Seiya shielded the group and told Diantha to help Meray and the others escape with Hoopa while he held Unbound Hoopa back.
• Seiya evolved into Mega Umbreon, countered Unbound Hoopa's attacks, and struck it into a building with Double-Edge.
• Seiya transformed into Mega Glaceon and froze the building and the surrounding area as Ash and the others watched from afar.
• Unbound Hoopa cracked the ice around the building, and a pillar of fire burst into the sky.

Hoopa summoned the Legendary Birds to battle Seiya, who fought back using several Mega forms while Diantha and Kalos League reinforcements arrived. As the Birds attacked Seiya and Diantha together, Lugia appeared and blocked their combined move.

• Hoopa summoned Moltres, Zapdos, and Articuno, and Seiya fought them using his Mega Glaceon, Mega Flareon, and Mega Sylveon forms.
• The Legendary Birds and Hoopa combined their attacks, breaking Seiya's Mystical Shield and sending him flying.
• Drasna, Pachira, Violet, Chakuro, and Olympia arrived to help the evacuation, and Diantha rushed to support Seiya with Mega Sableye.
• Diantha and Mega Sableye struck Hoopa with Shadow Ball, drawing the Legendary Birds' attacks toward them and Seiya.
• Lugia appeared and blocked the Legendary Birds' combined attack, prompting Diantha to recognize it as the Sea God.

Seiya and Diantha fought Unbound Hoopa and the Legendary Birds until Hoopa summoned a much stronger group of Legendary Pokémon. Ash arrived with Rayquaza and Mewtwo, leaving the battle poised to escalate further.

• Seiya battled Unbound Hoopa while Diantha and Mega Sableye joined Lugia to defeat the Legendary Birds.
• Unbound Hoopa sent the Legendary Birds back to the Orange Islands and summoned Dialga, Palkia, and Giratina, who quickly overwhelmed Lugia and Mega Sableye.
• Unbound Hoopa summoned Groudon, Kyogre, and Kyurem as well, leaving the Kalos League Trainers stunned by the growing army of Legendary Pokémon.
• Ash arrived riding Rayquaza, while Mewtwo used psychic power to save Diantha and Lugia from crashing to the ground.
• Rayquaza Mega Evolved to battle Groudon and Kyogre, and Mewtwo accelerated through the air and completed its own Mega Evolution.

Seiya was pursued through Desert City by Dialga and Palkia while Legendary Pokémon battles drew the attention of the world. After enduring their attacks, he finally decided to use an ability from another world and split into eight copies.

• Mewtwo chose to fight Unbound Hoopa, while Lugia and Diantha faced Kyurem, leaving Seiya to confront the Sinnoh Trio alone.
• The Kalos League shifted from trying to stop the Legendary Pokémon to rescuing survivors, and other regions sent Champions and Elite Four toward Desert City.
• Dialga and Palkia chased Seiya through the ruins, destroying buildings and streets with their attacks.
• Trainers worldwide watched Seiya evade the Sinnoh Trio and counterattack, while Zygarde wondered whether its Ultimate form could defeat even one of them.
• Seiya lost patience with the relentless pursuit and used Multiplication, splitting his body into eight.

Seiya split into eight Mega-Evolved Eevee forms and clashed with the Sinnoh Trio, causing Desert City’s space and time to become unstable. Steven Stone and Cynthia arrived to help restore the Trio’s consciousness, then ordered their Pokémon to protect Seiya’s forms from Palkia.

• Seiya divided into eight distinct Mega-Evolved Eevee forms, and they attacked the Sinnoh Trio with moves matching their types.
• The attacks collided, unleashing a massive energy wave that devastated Desert City and caused time and space to fracture.
• Steven Stone and Cynthia arrived and learned that the spatial-temporal disorder threatened everyone trapped in Desert City, so they agreed to focus on calming the Sinnoh Trio.
• Giratina fell after taking attacks from Mega Glaceon and Mega Leafeon, then struck at them; Mega Sylveon shielded Mega Glaceon, but both were knocked back.
• Palkia attacked Mega Sylveon and Mega Glaceon with Spacial Rend, and Steven Stone and Cynthia ordered Mega Metagross and Mega Garchomp to counter.

Seiya and the League Champions faced the Sinnoh Trio, as Steven Stone and Cynthia realized how outmatched their Mega-Evolved Aces were and Seiya began preparing a decisive attack. The chapter ended with Mega Flareon gathering and compressing an enormous fireball.

• Palkia’s Spacial Rend overwhelmed Mega Garchomp and Mega Metagross, but Mega Flareon and Mega Jolteon blocked its weakened remainder.
• Seiya spoke to Steven Stone and Cynthia through Telepathy, mocked their weakness, and said he could suppress two of the Sinnoh Trio while they helped hold back the third.
• Steven Stone and Cynthia sent Mega Metagross and Mega Garchomp to draw Giratina’s attention while Seiya’s eight Eevees faced Palkia and Dialga.
• Seiya’s side gradually fell behind as the Sinnoh Trio endured their attacks and drew seemingly inexhaustible power from their worlds.
• Mega Flareon moved behind the other Eevees and began building a hundred-meter fireball, then compressed it to ten meters as it gathered more power.

Seiya combined powers from other worlds to charge Mega Flareon’s enormous Gaia Fireball while his other Eevee forms battled Palkia and Dialga. He warned Steven and Cynthia to flee, leaving them shocked that his attack might kill Sinnoh’s three Legendary Pokémon and endanger the world.

• Palkia and Dialga sensed danger from Mega Flareon’s charging fireball and focused their attacks on him.
• Mega Vaporeon and Mega Leafeon used modified attacks to hold Palkia and Dialga back while Mega Jolteon, Mega Umbreon, and Mega Espeon joined the fight.
• Steven and Cynthia watched Seiya’s Eevee forms use extraordinary attacks as they continued battling Giratina with their Pokémon.
• Mega Sylveon Eevee and Mega Glaceon protected Mega Flareon while he charged a fireball more than three hundred meters wide.
• Seiya warned Steven and Cynthia that his Gaia Fireball could catch them in the blast and told them to lure Giratina closer before fleeing.
• Steven and Cynthia feared that Seiya planned to kill Palkia, Dialga, and Giratina, which could cause the world to collapse.

Seiya hurled a massive Gaia Fireball at Palkia, Dialga, and Giratina, and their attacks collided hard enough to shatter the space around Desert City. The battle left both sides struggling to keep reality from collapsing, with Mewtwo warning that stopping now would not save them.

• Steven Stone and Cynthia accepted Seiya's plan after realizing the people trapped in Desert City faced imminent danger.
• Seiya lured Giratina into position and hurled the enormous Gaia Fireball at the Sinnoh Trio.
• Palkia, Dialga, and Giratina answered with Spacial Rend, Time Roar, and Origin Pulse, and the attacks collided with Seiya's fireball.
• The clash fractured space around Desert City, so Unbound Hoopa released his control over the Legendary Pokémon and both sides tried to stabilize the situation.
• Cynthia called on the restored Sinnoh Trio to stop fighting, but Mewtwo explained that stopping or surrendering would break the balance and leave them doomed.

Arceus descended to stop the collapse of time and space, subdued the energy storm, and restored Desert City after defeating Unbound Hoopa. As Arceus prepared to leave, Seiya called out to it, and Arceus stopped to hear what he wanted.

• Arceus arrived and used its eighteen Plates to stabilize time, space, and the Distortion World, then reprimanded the Legendary Pokémon.
• Arceus used Judgment to break Unbound Hoopa apart and return its power to Hoopa, while explaining Hoopa's origins and its connection to Meray's family.
• Arceus restored Desert City, and the Legendary Pokémon summoned by Unbound Hoopa's rings returned to their homes.
• Seiya called out to Arceus as it turned to leave, and Arceus stopped to ask what he wanted.

After helping resolve Hoopa’s chaos, Seiya demanded compensation from Arceus, who agreed to hear his request. Unable to send Seiya to other worlds, Arceus was asked to grant him the power to transform into a human.

• The Legendary Pokémon, especially Dialga, Palkia, and Giratina, remained aggrieved after Arceus scolded them for the battle and wondered how Seiya had become so powerful.
• Seiya told Arceus that Hoopa had caused the mess and demanded compensation for helping clean it up.
• Diantha tried to defend Seiya, but Arceus stopped her and said the matter concerned only him and Seiya.
• Arceus asked Seiya what reward he wanted, and Seiya requested a way to travel to other worlds.
• Arceus said he could not send Seiya to other worlds, so Seiya instead asked for the power to transform into a human.

Seiya accepted Arceus’s power to become human and gained control over Pokémon evolution, along with all eighteen Pokémon attributes. His new human form turned out to look about eight years old, and Diantha claimed she would keep looking after him.

• Seiya chose the ability to become human over greater strength, and Arceus granted him the power to control Pokémon evolution in exchange for his loyalty.
• Arceus’s power transformed Seiya, giving him nine multicolored tails and the ability to wield all eighteen Pokémon attributes.
• After adapting to his new power, Seiya transformed into human form in front of Diantha, Cynthia, and Steven Stone.
• Seiya saw that he looked like a small child and protested when Diantha called him cute.
• Diantha picked Seiya up and told Cynthia that he would stay with her for now.

Eevee Seiya returned to the Mental Domain to show off his newly unlocked humanoid form, but his friends Snowballmon Seiya and Kuriboh Seiya were absent. The gathering welcomed Ainz Ooal Gown Seiya, a level-25 Third Prince of the doomed Kingdom of Licht En Yester High, whose desperate struggle against the coming Nazarick calamity had brought him to the Mental Domain.

• Eevee Seiya arrived at the gathering hoping to show off his humanoid form, then learned that Snowballmon Seiya and Kuriboh Seiya had not come.
• Naruto Seiya invited the newcomer to make contact with the group, and the Seiyas shared memories and power.
• The Seiyas learned that the newcomer was Ainz Ooal Gown Seiya, a level-25 native of Overlord and the Third Prince of the Kingdom of Licht En Yester High.
• Ainz Ooal Gown Seiya recalled that the Skeleton King would destroy his kingdom and that his level left him far weaker than Nazarick's Death Knights and Death Warriors.
• After Ainz Ooal Gown Seiya practiced swordsmanship until he fainted, he appeared in the Mental Domain.

After awakening with the power and memories gained in the Mental Domain, Seiya received a visit from his younger sister Lana. The chapter established his great popularity and talent, while revealing that his illegitimate birth barred him from inheriting the throne.

• Seiya woke in his luxurious bed after fainting from overtraining and realized his experience in the Mental Domain had been real.
• Lana visited Seiya, slipped into his room, and was gently reprimanded for ignoring proper etiquette.
• Klaim apologized for Lana's behavior, and Seiya told him to guide her rather than indulge her.
• Klaim reflected on Seiya's exceptional talent and popularity, and on how Seiya's birth to a Consort left him without a claim to the throne.

Seiya learned that Babrro and Zanac were plotting against him, while Lana questioned why he showed his talents despite having no interest in the throne. He told her that a Nation Destroyer crisis would soon threaten the Kingdom of Licht En Yester and humanity, leaving her with the reason he could not hide his abilities.

• Lana asked Klaim to bring her tea, then dropped her innocent facade once she was alone with Seiya.
• Lana warned Seiya that Babrro and Zanac were plotting to deal with him after hearing he had fainted.
• Lana questioned why Seiya displayed his talents when he did not want the throne.
• Seiya told Lana that a Nation Destroyer crisis would soon threaten the kingdom and humanity, so he could not conceal his abilities.

Lana deduced that Karn Village was connected to the disaster Seiya had warned about, and Seiya cautioned her against provoking dangerous people. After Lana left, Seiya learned that his fiancée Lakyus had returned to the Royal Capital, bringing back memories of how their engagement began.

• Lana inferred from Seiya's attention to Karn Village that the coming calamity would begin there.
• Seiya warned Lana that Karn Village was where disasters began and told her not to provoke dangerous people.
• Seiya considered how his growing power and influence might help him protect the Kingdom from the Great Tomb of Nazarick.
• Lana told Seiya that Lakyus had returned to the Royal Capital and planned to visit him.
• Seiya recalled that Lakyus, captain of Blue Rose and a descendant of the Thirteen Heroes, was his fiancée.
• Seiya remembered meeting Lakyus when she stormed the Royal Palace and mistook her confrontation for a quarrel with Lana.

After learning that Gazef was heading to Karn Village, Seiya rushed there to protect him and confront the threat. He arrived as Momonga and Albedo watched a Death Knight massacre the Theocracy’s disguised soldiers, and he ended the chapter killing a fleeing soldier who begged for mercy.

• After Lakyus returned home, Seiya learned he had been betrothed to her and decided to leave the Royal Capital to grow stronger.
• Seiya questioned Rambos III about Gazef’s assignment and realized the Warrior Captain was headed to Karn Village, where the Slane Theocracy planned to kill him.
• Seiya left the palace and raced toward Karn Village, using his abilities to travel faster than a horse.
• Momonga and Albedo watched their Death Knight slaughter the Theocracy’s soldiers disguised as Imperial troops.
• Seiya stopped the Death Knight’s sword with one finger, then killed a fleeing soldier who had begged him for help.