Sign up and battle with Pokémon that have only one type in the upcoming Simple Symphony Online Competition in either your Pokémon Ultra Sun or Pokémon Ultra Moon game. The competition goes from Friday, January 25, 2019 (00:00 UTC), through Sunday, January 27, 2019 (23:59 UTC). Trainers will be limited to 15 battles per day, with unplayed battles carrying over to the next day. 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, January 24, 2019 (23:59 UTC), and get ready to battle. All qualified participants in the Simple Symphony Online Competition will receive 50 Battle Points. Players must complete at least one battle to qualify.
Source: Pokémon Global Link