Navin
MALDREAD
No Serena please. I hope the Episode 1 and 2 stuff is all wrapped up in the first 10 minutes, and the Ho-Oh meeting concludes around the 15 minute mark. Then the rest of the movie can be spent recapping Ash's adventures in various regions in montages, but include new material of constantly meeting up and chasing Ho-Oh in each region. End it with Ash actually describing the film/his adventures to his Alola classmates sitting around a campfire when suddenly Ash catches Ho-Oh in the night sky flying off. OR something even more bold with a time skip and an older Ash coming face to face with Ho-Oh and ready to battle and capture it with Pikachu.