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The special could have been so much better with a few adjustments.
>remove Koharu entirely, as she contributed nothing of importance
>don't split the gang up, Ash, Go, and Dawn all jump into mirror world together
>don't introduce mirror-Ash and mirror-Goh, they added very little
>mirror TR only. OGs wasted time
>no Rocket grunts. Ash, Go, and Dawn can fight Jessie, James, and Meowth as a final battle without all the extra grunts
>Goh's Pokemon destroy the rings capturing Dialga and Palkia
>Ash's Pokemon subdue Dialga
>Dawn's Pokemon subdue Palkia
>Arceus shows up and breaks up the action
All of this with more character and less exposition. We don't need a full rundown of how all these worldly mechanics work, and we don't need separate characters coming to the same realizations in different scenes.