Register now to compete in the upcoming Online Competition featuring the stars of Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee! Only Pikachu and Eevee will be eligible for this fun competition. You’ll need a Pokémon Trainer Club account. After you log in, you’ll be able to read and accept the regulations on the Pokémon Global Link. You’ll also need your own Pokémon Ultra Sun or Pokémon Ultra Moon video game and a Battle Team with an eligible Pokémon in it. Accept the regulations on the PGL by Thursday, August 2, at 23:59 UTC, and get ready to battle!
The tournament goes from Friday, August 3, at 00:00 UTC, until Sunday, August 5, 2018, at 23:59 UTC. Trainers will be limited to 10 battles per day. There will be no age divisions. All qualified competitors will also be eligible to download a mobile-sized wallpaper that features whichever Pokémon was selected to battle the most. Good luck, Trainers!
Source: Pokémon Global Link