Relm for chase and stat stick, Ramza for BRV battery, and Vaan for burst damage.
General Strategy:
1. As usual, go for squall support strategy on the earlier wave.
2. In this run, i tried to force the boss change weakness to wind by getting broken several times, not hitting him for the elemental weakness and/or not to break him. Immediately summon pandemonium, when the boss change his weakness to wind (Yellow). Capitalize Vaan Whitewhorl to pump some crazy damage.
3. The Boss is immune to all type of BRV