SmilerMoon

Namine will be godlike in this fight, if you have Alice also even better. And if you have Defense Boost, use it! It saved me more than once. The setup that worked for me was sticking Namine in the first slot so I could copy her buffs at the beginning of every turn. My personal setup was Namine-KH2 Kairi-Timeless River Sora-KH2 Riku-Evil Queen-friend Daisy. If you have Alice I would stick her in the next slot so you could nullify her buffs after you copy them, making the fight a lot easier. I had my husband share his Daisy medal but any cure medal will work (Jiminy, Tinker Bell, Minnie, Pooh & Piglet), because you don't need it for the damage, you need the cure. I would suggest Cura or higher because with Daisy some rounds I only barely survived. Ava alternates between Strength x3 and Defense x3 each turn. Every turn starts with copying her buffs, then on the turns where she has boosted strength, I would use TR Sora to take her defense down for an attack, then come in with Riku for a hard hit, then save my gauges for cure, then when defense is boosted, I would only use Namine that round so as not to waste attacks when her defense was so high, except for Daisy (cure). I didn't even use the special attacks on the other medals. Basically every round starts with Namine and ends with curing. In between that only hit her hard on alternating turns (not when defense is up). I beat her on the second attempt (the first was a learning curve since I had no idea what to expect from her, went in and rearranged my green team). Didn't use any jewels for continues either. Hopefully this helps...