kingdom hearts 2 most hardest boss

and most frustrating. if you want hints i can actually help a little. the boss im talking about of course is sephiroth. and trust me when i say that what might work for me might not for you. and if you dont want to know what happens after you beat him say so. ill be waiting. and no im not going to spam i just figured id help some people who are frustrated with sephiroth beating them over and over again. and i did not cheat i actually beat the game without cheating once.