Registration for the Mega Melee Online Competition officially begins Thursday, September 14, 2017, at 00:00 UTC. You’ll need a Pokémon Trainer Club account and your own Pokémon Sun or Pokémon Moon video game with a party of eligible Pokémon. And you’ll need to read and accept the regulations on the Pokémon Global Link before the battle period begins. The competition goes from Friday, September 22, at 00:00 UTC, until Sunday, September 24, at 23:59 UTC. Players will be limited to 15 battles per day.