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In Faba's Revenge!, it was lured out of Ash's bag by Faba, who convinced it to teleport him back to Aether Foundation's sealed lab. After arriving, Faba captured it in a device designed to keep it from teleporting. Faba intended to use Nebby's power to open an Ultra Wormhole, but he was stopped by Ash's Pikachu and Gladion's Umbreon. However, after being released, Nebby evolved into Cosmoem, and the residual energy from the evolution caused a Wormhole to appear anyway.
In Revealing the Stuff of Legend!, after being brought to the Altar of the Sunne by Ash in the previous episode, Ash gave it to the Tapu, asking for their help. After being blessed by Tapu Lele and Tapu Fini, the four deities sung at the Altar, opening the mechanism within and causing Nebby to evolve into Solgaleo, much to the surprise of everyone present. After greeting the others warmly, Nebby accepted Ash, Lillie, and Gladion's plea to help Lusamine, giving Ash a Solganium Z. After having his Z-Ring upgraded to a Z-Power Ring by the Tapu, Ash and the others climbed on Nebby's back, and using the power of the Z-MoveSearing Sunraze Smash, created an Ultra Wormhole to travel to the place Lusamine awaited them.
In the following episode, Nebby, with Ash and the others, arrived in the Ultra Deep Sea. It traveled through with the group through the new world, mainly only attacking when it was needed. For example, when Lusamine, fused with Nihilego, summoned a stone wall to block the group, Nebby broke through with Sunsteel Strike. As members of the group started staying behind to fight Lusamine's Pokémon, Nebby remained with Ash. In the next episode, it and Ash had cornered Lusamine, who then flooded their island with a poisonous liquid. Due to Nebby's Steel-type giving it immunity to poison, it protected Ash from the liquid, and then carried him across it, dodging Lusamine's attacks along the way. After that, it went back with Ash's Lycanroc to help the others fight off Lusamine's Pokémon, who continued to heal themselves due to the Nihilego's energy. Everyone later succeeded after Lusamine was freed from Nihilego's control by Ash. Nebby then carried the group, now joined by the revived Lusamine, back to the Altar of the Sunne. After the conclusion of the episode, it parted from the group.
In The Professors' New Adventure!, Nebby appeared above the site of Professor Kukui and Professor Burnet's wedding. The class thanked it for its help in Ultra Space, to which it smiled back at them.
In Full Moon and Many Arms!, Nebby arrived in Alola, where it met up with Ash again and fought Dawn Wings Necrozma in an effort to free Lunala from its control. With its Sunsteel Strike, Nebby managed to knock Necrozma off of Lunala, causing it to break apart and fall into the sea. Shortly after, the elite Team Rocket unit, the Matori Matrix, attacked Nebby and Lunala by trapping them in an electrified net. After being freed by Ash's Pikachu and Gladion's Silvally, Nebby retaliated by attacking the unit's aircraft, forcing them to retreat. Immediately after, Necrozma emerged from the sea and possessed Nebby, causing it become Dusk Mane Necrozma. Ash tried to free Nebby, but was unable to stop Necrozma, and it fled into an Ultra Wormhole.
In The Prism Between Light and Darkness!, Nebby remained fused with Necrozma. The Ultra Guardians, with Lunala's help, pursued Necrozma to the home world of Ash's Poipole, and learned that Necrozma was preying on the two Legendary Pokémon in order to absorb their light and restore itself to its Ultra form. After being asked by Nagandel to save Necrozma, Ash, Kiawe, Lana, and Gladion attempted to use their Z-Moves to supply Necrozma with Ultra Aura and separate it from Nebby. However, they were only successful in making it more powerful. Communication between the Guardians and their home base was soon reestablished. After Lusamine, Wicke, and Professor Burnet shared what they knew, they arranged for the people and Pokémon attending the Manalo Festival to follow the lead of the guardian deities and share a portion of their Ultra Aura with Necrozma. Combined with the Ultra Aura of the Ultra Guardians and their Pokémon, Necrozma received enough light to separate from Nebby. Nebby then joined forces with Ash, Gladion, and Lunala, giving Necrozma one last boost of power with the combined Ultra Aura of their special Z-Moves, Searing Sunraze Smash and Menacing Moonraze Maelstrom. Through these efforts, Necrozma's strength was finally restored. After Ash and Pikachu bade farewell to Poipole, Nebby and Lunala led the Ultra Guardians back to Alola.
In the original Japanese version of the anime, Nebby's official nickname is simply ほしぐもHoshigumo as opposed to Hoshigumo-chan. The -chanhonorific is still used occasionally. In Now You See Them, Now You Don't!, Team Rocket caught sight of the unidentified Pokémon while Ash was buying donuts from their food truck. James surmised that the unknown Pokémon was the pre-evolved form of Koffing, and named it プチドガースPuchiDogars. This lead to confusion when the trio saw Cosmoem in Revealing the Stuff of Legend!, causing James to assume that there was an intermediary phase it evolves into in Alola, which he dubbed カタドガースKataDogars, but this was ultimately debunked when they witnessed "KataDogars" evolve into the Legendary Solgaleo. After its final evolution, Ash and his classmates typically refer to it by its proper name, Solgaleo.
As a Cosmog, Nebby shared many traits with human babies. It slept and cried a lot, but was easy to amuse and was naturally curious. Its cries were quite powerful, and they caused nearby people and Pokémon to cover their ears. In A Masked Warning!, its cries were so powerful, it sent Pikachu flying back into a tree. Nebby was a very fussy eater and appears to have a preference for the Japanese star-shaped candy konpeitō. It was also ticklish and enjoys playing hide-and-seek, as shown respectively in A Dream Encounter! and Night of a Thousand Poses!.
In Now You See Them, Now You Don't!, it was shown that Nebby tends to teleport people to places they are thinking or talking about. Rotom surmises this is because it knew little about the world around it, so it had to depend on telepathy and other people to develop its abilities. By the end of the episode, it had become attached enough to Ash, to the point where it would willingly teleport to him on its own whenever they are separated.
After evolving into Cosmoem, Nebby hardly spoke, moved, or emoted, reflective of its coccoon-like state. However, after evolving into Solgaleo, it appears to have grown into a more mature version of itself physically and mentally, letting Lillie hug it, happily accepting konpeitō from Ash, and licking him affectionately. As a Solgaleo, Nebby can create Ultra Wormholes at will with the help of a Trainer with a Z-Power Ring, a Solganium Z, and its Z-Move, Searing Sunraze Smash.
Description: Solgaleo's Trainer turns the Solganium Z in their Z-Power Ring clockwise and strikes a series of synchronized poses to build Z-Power. Solgaleo then changes to its Radiant Sun phase and opens an Ultra Wormhole and carries its riders through it. Or, without anyone riding it, Solgaleo jumps into the air, cloaks itself with orange-yellow energy, spins itself around, and slams into the opponent with full force.
From 星 hoshi (star), 雲 gumo (cloud), and 星雲 seiun (nebula)
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