Pokémon Ultra Sun and Pokémon Ultra Moon are scheduled to be compatible with the Pokémon Global Link (PGL), a linked website that allows you to connect with other players all over the world using saved and gameplay data from their Pokémon series games. The upcoming duo of Pokémon games will be compatible with the PGL when they launch globally on November 17, 2017, for the Nintendo 3DS family of systems.
Pokémon Ultra Sun and Ultra Moon compatibility with Pokémon Global Link confirmed
Pokémon Blog 