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Well, it was already one of the best pokemon in existence before it got a mega, now it has a sky-high attack (pun intended), better defenses, and better speed as well as not needing to hold an item.
I assume they'll give Zygarde this same treatment and make it so he doesn't need a mega stone to mega evolve. He already has 80 less BSP than Xerneas/Yveltal, mega + any hold item would put him at 700+ BST.
