The Ultra Final Online Competition, where the whole Pokédex was eligible for you to use to make your team, has wrapped up for players of Pokémon Ultra Sun or Pokémon Ultra Moon. Plus, participants were able to use duplicate Pokémon and duplicate items. And every Pokémon was set to Lv. 50 for the duration of these Single Battles. The competition went from Friday, October 4, at 00:00 UTC, until Sunday, October 6, at 23:59 UTC. All qualified participants in the Ultra Final Online Competition will receive a Shiny Tapu Koko. Players must have completed at least three battles to qualify.
Source: Pokémon Global Link