How do you beat the ruler of the sky on kingdom hearts 358 days over 2

Destroy his tail bit by bit. you need omega gear or prestige gear or chaos gear. equip as many cures as you possibly can -this means unequipping your other magic types. Once you get his tail gone, attack the bubble uder his throat. If and when he glows red, glide out of the way at all costs! the coin attack is easy just stay near the edges of the screen near the water. BE AT LEAST LEVEL 43!!!!!!