Nebby (anime)

This Cosmog, nicknamed Nebby, is a -type Legendary Pokémon in the anime.

Biography
Nebby first appears in Ash's dream where he witnesses it being created by Solgaleo and Lunala. Then, on his way to the Pokémon School Ash and Pikachu see Tapu Koko where it leads them to Cosmog who they find sleeping. Once Ash arrives at the Pokémon School he shows his classmates the little Pokémon amazed at the discovery.