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Not gonna happen, but I could see Zygarde being a cool playable character. He could alternate between the speedy, lighter, and quadrupedal 10% form and the slow, heavier, bigger 50% form. Final Smash would obviously be turning into 100% form, and either wrecking shit a la Giga Bowser or just using Core Enforcer.
Knowing Sakurai, though, we're more likely to get the Pokemon Conquest main character or something.