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>flame plate says its power was conferred from a "defeated Colossus"
>Regigigas is the 'Colossus pokémon'
>all plates' inscriptions are about the creation of the world and are connected to Arceus's lore so the "defeated colossus" is implied to have been defeated by Arceus
>in PL:A you need three plates to awaken Regigigas further solidfying its connection to them
is there any more evidence I'm missing? Because I can perfectly see WHY this theory that Regigigas is the last member of a race of giants Arceus destroyed came to be, and there's no problem if you believe in it, but come on: none of this is enough to state beyond a shadow of a doubt that this is the intentional case as OP is doing. This could still be just small coincidences and it's hard to believe OP doesn't see that.