Just went to see it. It might have been my inflated expectations from hearing a lot of people talk about it so fondly, I wasn't too impressed. It was ok.
My favorite moments in the film were those when nothing was really happening, but pokemon were shown just naturally interacting with the world. Which makes me think, yes, this universe can work. The pokemon look fantastic and their portrayal was on point.
My biggest complaint about it was that I feel like the story itself could have been about any monster-creatures in general, not just pokemon. I was hoping for a more low key story about a buddy bonding with his poke-buddy (which I suppose kind of happened) but didn't seem to make much use out of pokemon itself (which may be a plus? More portrayal of training/catching could potentially have been a bit disconnecting in live action). So basically the story didn't interest me much. And can we really even say that he was bonding with a pokemon? Also the thing with me two at the end confused me, why was the son necessary again?
tl;dr it was ok, 5 out of 9, true neutral.