So I played Kingdom Hearts II Final Mix and finished it near the end of May. I tried my best to unlock the secret movie, but failed. Completion of Gummi Routes means collecting all the treasure for all the Gummi missions. It's actually one of the most annoying things to accomplish in this game, and it's easier to unlock the secret movie on a harder difficulty. Maybe I'll play this game again some other day.
Xenoblade is just as epic as I remembered. Actually, more epic than I remembered because I only played through the Wii version once and forgot about a lot of the stuff that happened. Definitive Edition has an Event Theatre, at least that's how they spelled it on the title screen. Uhh, I turned off Casual mode before the final boss.