In the introduction, Lillie escapes the Aether Foundation with Cosmog, nicknamed Nebby, in her bag. After Lusamine uses it to open holes to Ultra Space, Nebby evolves into Cosmoem and becomes dormant. The next part of the plot is taking Nebby to the Altar of the Sunne/Moone to save it and rescue Lusamine. Cosmoem would later evolve into Solgaleo/Lunala, where it eventually officially joins the player. In Pokémon Ultra Sun and Ultra Moon, Nebby played the same and this time, merging with Necrozma to become Dusk Mane/Dawn Wings (and Ultra) Necrozma.
Pokémon spin-offs[]
In the anime[]
Cosmoem (Nebby) in the anime
Cosmoem debuted in Faba's Revenge!, where Nebby evolved. Nebby later evolved into a Solgaleo in Revealing the Stuff of Legend! after being blessed by the Guardian deities.
In Pokémon Evolutions, a Cosmoem nicknamed Nebby was used by Lusamine to open an Ultra Wormhole. It later evolved into Lunala at the Altar of the Moone and later battled and absorbed by Necrozma to become Dawn Wings Necrozma.
Origin[]
Cosmoem has characteristics of both a stylized sun and a stylized moon, having rays and a pair of crescents, respectively. Its enormous weight despite its extremely small size shares similarities with super-compressed astronomical bodies such as black holes and neutron stars. Given its description, it seems to be an embodiment of star formation in general. It may also be based on the idea of the world egg. When viewed from the front, its shape resembles an eye.
