Use Shock with Steiner, Dragon Crest with Freya(powered up) and Frog Drop with Quina (powered up). But as I didn't have Freya or Quina levelled up, I just reflected Flare off Vivi (with double reflect on) and I just attacked with Zidane(after doing the friendly Yan quest) and of course hurl any Dark Matters you may have at him.