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Reminder that if we had gotten a third gen 6 game, it probably would have been another paired version with the box mascots being Zygarde who's absorbed Xerneas or Yveltal. In fact it may have worked the same as Necrozma, where it has the two forms of Zygarde-Xerneas and Zygarde-Yveltal, and then they both can "Mega Evolve" into the Complete Form we have today.