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So if I'm getting this right
>Zygarde always had Power Construct and its stone
>but while Calem ran away from the Flare HQ it moved there to tank the Ultimate Weapon's ray
>when Calem goes to Terminus Cave in the postgame Zygarde is already handicapped saving Kalos and Lysandre and is starting to move to other lands to recover, so only a 50% of its body is available
>and the Zygarde Cube wasn't found yet so even if you caught it you wouldn't be able to change it to 10% form
>in the next two years it has arrived into Alola and moved its five cores into the region's five most capable trainers' houses to help against the ecosystem threat the UBs are (in Ultra, Sina and Dexio retrieve some cells themselves and it teams up with them until it finds the most capable trainer, you)
>a few years later its cells are back and fully recovered from absorbing lots of light from the Alola region, seeks Lysandre and makes him pay for its second chance at life by making him its lackey so they can keep an eye on the influence of the other Ultimate Weapon and a new age of trainers
>the whole game is Zygarde's trial to find its champion, someone capable of handling its power and mega evolve it to save the world, akin to Delta Episode in ORAS when Zinnia and you had to reignite Rayquaza's full power
>upon mega evolving Zygarde's ultimate move is transformed into a pseudoZ-move as well, one with the same power as the strongest Devastating Drake, a similar naming scheme to Light that Burns the Sky and the capacity to run throught Protect and defy nature laws to damage absolutely everything without fail
I'm not missing anything, this is it, right? God damn Zygarde is the fucking coolest holy shit what a guy