Ultra Space, Pokémon Wiki

Ultra Space is a network of several different dimensions accessible though a dangerous portal, the Ultra Wormhole. It is the home of the Ultra Beasts, some other people and Pokémon; each species of inhabitant of Ultra Space has its own dimension to live. Ultra Space is an interdimensional spatial realm filled with crystalline meteoroids and populated by Necrozma and multiple instances of members of the Cosmog line. It links to a number of different universes and dimensions through Ultra Wormhole

Ultra Recon Squad, Pokémon Wiki

Released - ULTRALITE

Ultra Space, Pokémon Wiki

Ultra Space, Pokémon Wiki

Pokémon Ultra Sun and Ultra Moon - Wikipedia

Ultra Space, Pokémon Wiki

Ultra Space Wilds - Bulbapedia, the community-driven Pokémon

Ultra Space, Pokémon Wiki

A wild Kartana in Ultra Space, International Pokédex Wiki