The Pokémon Company has announced that a total of 5,954 Pokémon Sun and Moon players have been banned from online activity for having altered save data. This ban prevents them from using Game Sync, entering in Rating Battles and Battle Competitions, as well as participating in Global Missions. When they try to perform these actions, they get an error message with the error code 090-0212. The Pokémon Company promises to continue pursuing those with edited and illegal save data and will enact similar restrictions without notice.
Source: Serebii
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