The 2019 International Challenge May Online Competition is no longer underway in Pokémon Ultra Sun and Pokémon Ultra Moon. The competition went from Friday, May 24, 2019, at 00:00 UTC, until Sunday, May 26, 2019, at 23:59 UTC. All qualified participants in the 2019 International Challenge May Online Competition can now receive a Shiny Tapu Fini by signing into the Pokémon Global Link by clicking here. The top players also received Championship Points, which contribute toward earning an invitation to the 2019 Pokémon World Championships. Players must have completed at least three battles to qualify.
Source: Pokémon Global Link