Actually went and watched this one, and certainly will again once it's dubbed.
Holy fuck. That had to be one of the craziest endings they could've come up with. I LOVED how it cut to Pikachu waking up, not remembering what he'd done. The IMPACT! THIS is what the last 25 years have been building up to: This one, final defining moment. There is literally nowhere they can go with Ash from here, and the flashbacks to everyone Ash had traveled with, and all his Pokemon... what else could that have meant?
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Come check out my movie watchthrough topic: https://gamefaqs.gamespot.com/boards/8-gamefaqs-contests/80167031