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So is there some connection between Zygarde, Xerneas, Lunala, Solgaleo and Yveltal?
When this pattern first appeared people thought it might mean something. Then when Sun and Moon were announced people thought its nothing because Z was deconfirmed and many thought Zygarde forms are "anime exclusive"/ Even when Zygarde was revealed to be in SM many said it'll be post game but now we do know we collect the cells and cores in the main part.
Will Zygarde be a part of UB plot (it does make sense since he is the protector of the ecosystem) and does it mean there's some bigger connection between Xeneas, Yveltal and Solgaleo, Lunala? Life-Sun, Death-Moon? Zygarde-Balance, Order? Possibly Marshadow-Chaos?