turn off any cheats you have enabled
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postgame after beating the elite 4 then its either in your pokemon status page or at a pokemon center don't remember which
Some Pokémon are Shiny Locked, meaning they cannot be Shiny when you encounter or obtain them, no matter what. This lock is almost always reserved for Legendary or Mythical Pokémon, not ordinary Pokémon.
"The Pokémon Company have begun a new ban wave through Pokémon HOME and the main series games on Switch, restricting online features from the main games and Pokémon HOME for using illegally modified Pokémon and other unintended measures. These bans may be temporary or permanent and will restrict...