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How could Gamefreak go about making shinies and Mythicals rare? Isn't there a way they can give them unique IDs so they can track them all and make them only obtainable online/directly from Gamefreak themself? This way when someone goes online they can detect any clones or foreign IDs that were made.
I think what I'm basically asking is if there's any way Gamefreak can essentially code "event codes" into the actual Pokemon.