I just finished watching it and I'm quite pleased.
Nice mix of action and dialouge.
Dusknoir got a really good voice, as did Grovyle.
I liked the montage at the beginging show Piplup, Chimchar, and Grovyle's adventure that we weren't able to see. The Energy Ball, Fire Spin, and Whirlpool combo was pretty neat too. And the watching the Guild getting frozen in time was a nice touch.
I really hope they make another one showing the battle vs. Primal Dialga, but I won't my hopes up.
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RIP Original Y save file. Never using PokeBank again.