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Pretty sure the point of the riddle is:
>Which of these isn't tied to a single legendary
Which the answer is Megas, since they came from the XY cannon or Rayquaza depending on the games.
Meanwhile, the Z-crystals came from Necrozma, the Dynamax Energy came from Eternatus, and the Tera Orbs will likely come from the Legendary the DLC will be about. The weird orb thing in the book.