How can you beat sepheroth in Kingdom Hearts 2

You need at least to be on level 60. I looked on the Internet, and it showed me step by step what to do, because it is EXTREMELY difficult. Sorry, if I wasn't much help, I cheated too.

Of course you could pass him. When I was battling him on level 77, I just needed a little more blood for him to lose, but when I kept hitting him, the blood of Sepheroth's wouldn't drain then poor Sora-kun died; then later I did some things, and I beat him!!

1. 
   You have to level up to 99; the game will not let you pass him unless you'r on Level 99 (Not true, I beat him at level 84!).
2. 
   se the key-blade oblivion, fatal crest, or the ultimate weapon or you can use the most powerful weapon you have IF you were to lazy to go further in the game to get these key-blades.
3. 
   Use trinity.

Now tips:

1. 
   When it looks black around the place for like a few seconds, TAP THE TRIANGLE BUTTON TILL THE BLACK FADES AWAY, he's going to hit you.
2. 
   KEEP YOUR FINGER ON THE TRIANGLE BUTTON AT ALL TIMES IF YOU WANT TO BE SAFE.
3. 
   When he flies up and turns pinkish/purple, get ready to put hi-potion, or even better, an elixer because he is going to drain everything you have, counting HP & MP so careful, REMEMBER TO PUT THE HI-POTION OR THE OTHER ONE AFTER HE DRAINS EVERYTHING!!!(*improvement: use trinity limit or run up and use aerial spiral to stop this near-fatal attack)
   
4. 
   Try to always be locked on to him and watch his every move.
5. 
   Put your hi-potion or the other one when your blood is half or something because he hits hard.
6. 
   DON'T DIE!

That's all that I can help you with and as far as I can explain, so watch my Sora's tail, and DO NOT DIE! I passed the game 5 times on standard.

Have fun and DONT DIE!