>>49219810Arceus Diamond Dex Entry - "It is described in mythology as the Pokémon that shaped the universe with its 1,000 arms."
I feel that it could stick an arm through a wormhole, holding the energy needed in its hand before depositing it into a cradle/nest/Egg made and related to the parent mons.
Semi-unrelated - the triangle with circles/casting circle/leylines Arceus uses in that cutscene are the game symbol for BDSP
