Registration has concluded, and the battles have officially started in the Weakness Cup Online Competition. In the Weakness Cup, Pokémon Sun and Moon players are bound to face an interesting challenge using teams of Pokémon that each have at least five type weaknesses. Registered competitors can battle up to 15 times per day. The competition concludes on Sunday, July 30, 2017, at 23:59 UTC. If you missed the chance to register and battle in this competition, keep checking the Pokémon Global Link (PGL) for more opportunities to battle.
Source: Pokémon Global Link