1/2 on this. Damage was tight since I didn't have native Sheep Song. So had to give it up for Ashe's BSSB. Still won with only 2 medals lost on damage taken.
Forgot to screenshot my characters but I used:
Braska: Valefor R4/Protectga
Lenna: Curaja R5/Shellga/Pride of Tycoon
Mog: Multibreak R2/Halting Rumba R3/Heroic Harmony
Rinoa: Ramuh R5/Chain Thundaja R1
Quistis: Ruinga R4/Thundaja R4/MG8
RW: Ashe BSSB
It was really close, but Ashe's BSSB was still the stronger choice even w/o Sheep Song.