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according to the gen 7 games [dialogues], looks like we had to get third version of kalos where we had to battle team flare and collect zygarde cells to assemble second zygarde to battle one created by lysandre
this makes me think that alola had to be bigger and switch version of the games, OR it had to be this year generation, probably with only ultra sun and moon and necrozma plot before moving to switch in 2020
game freak just makes me sick of their bullshit