This article is about an episode of thePokémon animated series that has not beendubbed into English. As such, its coverage may contain romanized Japanese names, rather than dub names.
Mega Evolution - Roy (Japanese:ロイ ――修行Roy—Training) is the 112th episode ofPokémon Horizons: The Series, and the 1,344th episode of thePokémon animated series. It first aired in Japan on October 10, 2025 and is scheduled to air in the United Kingdom on February 27, 2026.
Spoiler warning: this article may contain major plot or ending details.
On theBrave Olivine,Liko andDot are watchingRoy andUlt have abattle. UltMega Evolves hisSableye in Mega Sableye and Roy follows up by Mega EvolvingLucario into Mega Lucario. The two Mega Evolved Pokémon exchange blows, with the winner of the battle being unknown. Liko and Dot mention how the two boys had been training inKalos together before wondering how Roy met Lucario. Roy reveals he went on a journey toLumiose City withCrocalor,Kilowattrel, andCaptain Pikachu.
Upon arriving in the city, Roy is instantly amazed by the view of the place and eager to grow stronger as aTrainer. However, he gets lost while trying to get to somewhere. Cap tries to help the young Trainer, but he is forced to get away from some people who accidentally triggered his "allergy". Roy follows him and ends up atLumiose Gym. The sound of a battle grabs the group's attention and being curious about it, Roy accidentally runs into Ult. The two get into an argument despite Roy apologizing before getting distracted by the battle again. When they take a closer look, they see a battle between aGardevoir andSlowbro. Gardevoir usesMoonblast on Slowbro, but theHermit Crab Pokémon usesAmnesia to power up and negate it. Slowbro then retaliates withHydro Pump that is evaded. The Trainers of the two battling Pokémon Mega Evolve their Pokémon into Mega Gardevoir and Mega Slowbro respectively and Roy becomes excited at seeing Mega Evolution up close. Ult ridicules Roy for being excited at Mega Evolution, retorting how Sableye would be able to do it if he was interested, prompting Roy to return to the battle while being unsure what to make of Ult. The battle ends with Mega Gardevoir dealing the finishing blow on Mega Slowbro and a strange person on the side promotes Mega Evolution to the crowd. Roy and Ult, being the only ones interested, immediately come up to him to ask about Mega Evolution and the guy introduces himself asMaster Mayonnaise.
Master Mayonnaise brings the two boys to a café to discuss about Mega Evolution further. He begins by explaining what is Mega Evolution to Roy and Ult before revealing the conditions to Mega Evolve. The first condition is having aKey Stone that resonates with a Pokémon'sMega Stone and the second is a strong bond between a Trainer and their Pokémon. Roy and Ult become eager at the idea of their respective partners Mega Evolving, but Master Mayonnaise points out no one has seen a Mega Evolved Crocalor before. Roy doesn't become disheartened by that as he focuses on being the first to Mega Evolve Crocalor. Master Mayonnaise gives the two boysMega Rings to begin their training in mastering Mega Evolution, telling them to find Mega Stones next since they're usually hard to find. Ult reveals Sableye found itsSablenite while looking for shiny stuff. Crocalor brings over a random rock to not fall behind before the two boys head off.
Roy and Ult look forMayo Maze Palace based on a recommendation from Master Mayonnaise, who tells them to challenge the strongest Pokémon in there,Yellow Blast. Roy realizes Ult would be able to bring them to Mayo Maze Palace since he knows the layout of Lumiose City, but the latter refuses, telling the former to find the way himself. After some struggle, Roy successfully arrives at Mayo Maze Palace, with Ult showing up shortly after. The two enter the palace cautiously and separate to find Yellow Blast first. However, the layout of the place gives them a hard time finding Yellow Blast until Crocalor and Sableye bump into each other. Roy and Ult run after their Pokémon and see a door on the other side of a long hallway. Believing Yellow Blast is behind the door, Ult runs ahead first. Unfortunately, he falls into a trap before Sableye could warn him about it, though Ult is able to get out with Kilowattrel's help. As they are stumped on their next move, Crocalor finds a strange spot on the wall. Pushing it, he discovers a hidden passage way with a set of stairs that eventually leads the group to Yellow Blast that is revealed to be aShiny Lucario, who challenges them to a battle. They begin by getting Sableye and Crocalor to usePower Gem andFlamethrower respectively, but Yellow Blast dodges it all seamlessly. Due to its high speed, Yellow Blast manages to attack Sableye and Crocalor before they could dodge. Roy and Ult get their Pokémon to attack again, but Yellow Blastknocks them out before they could even attack, leaving it the winner as Roy and Ult are shocked by the strength of Yellow Blast.
The title text for this episode is shown directly over the background, without a separatetitle card segment. As such, the title is not read aloud. Since there is no opening theme, the series logo (with the arc subtitle) is shown directly over a shot ofLumiose City.
This episode does not contain anyeyecatches, instead having theseries logo on a corner of the screen before and after the commercial break.
This is the last episode to air in Japan before the release ofPokémon Legends: Z-A.
TheTaiwanese Mandarin andHong Kong Cantonese dubs of this episode were released on the Traditional Chinese PokémonYouTube channel at 6:30 PM (UTC+8), at the same time the Japanese version was released on the Japanese YouTube channel after its television airing. In the regular episode order, the Taiwanese Mandarin dub was midway throughthe second season, while the Hong Kong Cantonese dub was between thefirst and second seasons.
TheKorean dub of this episode aired on October 14, 2025 (four days after the Japanese airing), before the Mega Voltage arc.
During the ending animation, a blurry photo ofLooker (alongsideCroagunk) can be seen at theLooker Bureau where Roy and Ult were eating and where Emma was serving them food.
This is the only time Ult's Sableye was shown holding itsSablenite as when Ult took it out of his pocket to show it toMaster Mayonnaise, Sableye reached out for it and held onto it for the remainder of the scene. Similar toDawn's Piplup and hisEverstone, Sableye has not been shown holding the Sablenite ever since and theMega Stone would just magically appear before it when SableyeMega Evolves.
In the Taiwanese Mandarin and Korean dubs, the on-screen "Mayo-Maze Palace" text is removed.
In the Hong Kong Cantonese dub, the on-screen "Mayo-Maze Palace" text is replaced with the local script.
In the Korean dub, clips of Roy and Ult Mega Evolving Lucario and Sableye are used at the very beginning of the episode (before the cold open) for an 8-second logo segment.
