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Keldeo Movie...I think there was a good movie here. They did well by removing TRio entirely from the movie altogether- but I think it'd have worked even better if they removed the human characters entirely. The main character of this movie is Keldeo and Ash once again only really functions as a cheerleader/therapist. Perhaps that's the problem with mid to late Ash. He was a lot like Loki- there to bring out the best in everyone with himself resigned to jobbing and team resets. As for Iris and Cilan? You'd barely remember they were the MCs of this generation with how this and the last movie treated them.
Getting back to the topic. This is a role you could have filled with Virizion. Have here be there to re-assure or encourage Keldeo after his fight like a good mom.
A few more changes I'd make. Give a more thorough explanation to the fight with Kyurem. I'd get that it was some kind of initiation ceremony but, all the time, I kept thinking back to the Dex Entry and original game lore and wondered what changed here.
Next, fix up Keldeo's character arc. He goes from cocky and over-eager to scared shitless (okay makes sense) then goes from scared to brave. And he never gets reprimanded once for starting the fight, when he wasn't ready. This SHOULD logically have been a movie about a stupid kid getting knocked down a notch- only to become a better person because of his experience.