If you have any gear for Rosa (perhaps from Tellah), give it to her now, because you're in for a fight. You'll want to keep Kain in the back row since he can Jump from there and you have too many front-line party members.
Valvalis has no weaknesses, but when she starts spinning she is difficult to damage. Kain's Jump will end her spin, allowing you to continue the assault. She also likes to use Wind and inflict Gradual Petrification, so Rosa will have plenty to do.
Valvalis has no weaknesses, but when she starts spinning she is difficult to damage. Kain's Jump will end her spin, allowing you to continue the assault. She also likes to use Wind and inflict Gradual Petrification, so Rosa will have plenty to do.