Pokémon Global Link registration details:
To register, log on to your account from the PGL homepage and select Online Competitions in the main menu. You’ll then be able to read and accept the regulations on the PGL. You’ll need a Pokémon Trainer Club account, your own Pokémon Sun or Pokémon Moon video game, and a Battle Team of eligible Pokémon. Accept the regulations on the Pokémon Global Link by Thursday, May 25, at 23:59 UTC, and get ready to battle!