Nebby debuted in SM044. It first appeared in Ash's dream, in which it was created by Solgaleo and Lunala at the Altar of the Sunne. Later, Tapu Koko led Ash to where it was sleeping. Taking it to the Pokémon School, Ash and his classmates found that the unusual Pokémon emitted a high-pitched scream whenever it cried. Eventually calming it down, Ash decided to take care of Cosmog, which Lillie nicknamed Nebby. When Ash brought it home with Lillie, he met Professor Burnet, Lusamine, Wicke, and Faba, who revealed that Nebby could be an Ultra Beast. Lusamine later offered to take Nebby with her to the Aether Paradise, but Ash declined because of his promise to take care of Nebby. Lusamine gave in and entrusted Nebby's safety with Ash.
In SM050 it evolved into Cosmoem.
Personality and characteristics
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 -chan honorific is still used occasionally.
Having only just been born, Nebby shares many traits with human babies. It sleeps and cries a lot, but is easy to amuse and is naturally curious. Its cries are quite powerful, and they cause nearby people and Pokémon to cover their ears. In SM047, its cries were so powerful, it sent Pikachu flying back into a tree. Nebby is a very fussy eater and appears to have a preference for the Japanese star-shaped candy konpeitō.
In SM045, it was shown that Nebby tends to teleport people to places they are thinking or talking about. Rotom surmises this is because it knows little about the world around it, so it has to depend on telepathy and other people to develop its abilities. By the end of the episode, it has become attached enough to Ash, to the point where it will willingly teleport to him on its own whenever they are separated.
Moves used
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Using Teleport
as a Cosmog
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| A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
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