Very handy advice Tavrobel, thank you. Just one question though :
Quote Originally Posted by Tavrobel View Post
Assuming we don't use the Square button (which we don't), the easiest way would be to equip your best Keyblade, and take advantage of Berserk Charge. If you get knocked into the air by an attack, use Retaliating Slash (lol Square wut) when he shows up to attack you; this causes him to get hit, and thus begins a long chain of hits. While your MP is gone, you'll never be able to complete your combo attacks. Normally this is disadvantageous, but in the air, there is very little for Sephiroth to do other than get hit.
How come square's a bad idea? I don't use it much as is, mainly 'cause Guard is slow, but I seem to be missing something too.