I watched it, and I enjoyed it C:
The movie was enjoyable! Not sure how I feel about Carbink/Diancie's movement though. I figure they could float but apparently they just hop around on the ground (or float 1 inch above the ground).
Spoiler:
Though at one part Xerneas says she knows Diancie has been looking for her. And apparently Diancie has been searching for months and in this time her kingdom has decayed. So Xerneas let the kingdom fall basically.

Kinda meh on the first Mega Special but the last one was pretty good. Hate the girl though, I feel like she adds nothing beyond being annoying o.e