I kinda remember seeing the Rainbow Prophecy being mentioned somewhere in this forum, and correct me if I'm wrong but I think I remember seeing Zygarde being mentioned in the theory as well. Which would fit, Zygarde is supposed to fix ecosystems when they fall apart and there's the "rainbow" coloring in its chest, plus there's a hint of rainbow aurora coloring in its Core Enforcer signature move. Solgaleo and Lunala would fit into the whole thing because like I said earlier in another thread, you absolutely cannot have life on Earth without the sun and the moon. I'm not sure how the island guardians would fit... but I wonder if there's some sort of hierarchy system for ecosystem protection levels that goes something like this:
Sun=Solgaleo, Moon=Lunala ---> Zygarde=Earth ---> Island Guardians=Alola Islands
