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>it's time travel
it's pretty "normal" for there to be a legendary who can control time (Celebi/Dialga/Arceus) so it's easy to believe there's a pokemon pulling Pokemon from other time periods/timelines to the present
>it's imagination
it's mildly insane to think there's a Pokemon capable of creating other Pokemon (or at least using human minds as a catalyst for its alchemy) outside of Arceus, not denying imagination though
either way the disk creature probably won't live up to the hype tbqh