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I mean it’s definitely related to Arceus, either as reference to the ‘thousand hands’ that most say are Unown, that helped him when he created PokéEarth.
It could be what was used to create the Ultra Space that separates worlds, which could also be how UB’s exist, or Eternatus could be native to Ultra Space, or perhaps is one of a thousand existing in various alternate dimensions of the Multiverse, where it was used to help create worlds for these Pokémon.
