Sign up and battle with Pokémon from the National Pokédex in the upcoming World Championships Friendly Online Competition with your Pokémon Ultra Sun or Pokémon Ultra Moon game. You’ll need a Pokémon Trainer Club account to compete. After you log in, you’ll be able to read and accept the regulations on the PGL. You’ll also need your own Pokémon Ultra Sun or Pokémon Ultra Moon video game and a Battle Team of eligible Pokémon. Accept the regulations on the Pokémon Global Link by Thursday, September 13, 2018, at 23:59 UTC, and get ready to battle!
The competition goes from Friday, September 14, at 00:00 UTC, through Sunday, September 16, 2018, at 23:59 UTC. Trainers will be limited to 10 battles per day. All qualified participants in the World Championships Friendly Online Competition will receive 50 Battle Points. Players must complete at least one battle to qualify.
Source: Pokémon Global Link