Sun & Moon cheaters beware, The Pokémon Company is coming after you!
The Pokémon Company has already announced the fact that they have banned 5,954 gamers from Sun & Moon’s online functions and will continue to pursue those who attempt to cheat the game and possess altered save data.
So if you were wondering why you keep getting the error code 090-0212 when you attempt to sync your game, this is why/ This ban also stops you from being able to participate in Global Missions, Battle Competitions and Rating Battles.
There has yet to be any mention of The Pokémon Company lifting such a ban, so until otherwise stated, consider this a permanent ban.
Source: Serebii
Beware, Pokemon cheaters!