Unlike my Intense Brawl Boss Battles where I have separate videos of Zelda and Sheik, I used both of them one after the other throughout Melee's Adventure Mode.
One good reason for this is because Brawl has to load as the wielder of the Triforce of Wisdom changes between forms, while Melee has it occur almost instantly. This eliminates any loading and therefore any potential mistimings during a match, as the amount of frames to Transform appear to always be the same.