The 2019 International Challenge May Online Competition is now underway in Pokémon Ultra Sun and Pokémon Ultra Moon. The competition goes from Friday, May 24, 2019, at 00:00 UTC, until Sunday, May 26, 2019, at 23:59 UTC. Trainers will be limited to 15 battles per day, with unplayed battles carrying over to the next day. All qualified participants in the 2019 International Challenge May Online Competition will receive a Shiny Tapu Fini, and the top players will receive Championship Points, which contribute toward earning an invitation to the 2019 Pokémon World Championships. Players must complete at least three battles to qualify.
Source: Pokémon Global Link