I was limiting my use of BRV to HPs in this until the end.
Spent along time just fucking sitting on this video; probably over a year because, honestly, I really don't think I can ever top this video.
For those curious, to record fights against him, you must create a quest in the 'Creation' menu and add all three of Chaos' phases in a Party Battle set to Tournament mode. You'll be able to record every fight against him, but they won't have the same openings as they would in the Story and Battle Mode, and will be treated the fight like a Party Battle.
There are a few minor oddities to the final phase: he doesn't use any voice clips (aside from roars) during Scarlett Rain or Utter Chaos / Brink of Despair, for whatever reason. So he doesn't taunt you when he finishes BoD sitting on his throne.