The battle with Edea and Seifer at Galbadia Garden. First, you have to go through Seifer, before taking on Edea, but Seifer is a shell of what he was in the last battle, he only does a normal attack, and has far less HP. When it's time to tackle Edea, this is where the real battle begins. The reflect strategy won't work anymore since she uses a demi type attack called Maelstrom, and other spells that can't be reflected. Watch out near the end of the battle, since she may cast Death on a character. Also make sure to draw the GF Alexander from her.