I Play Kingdom Heart 2

today i play kingdom heart 2
walao , i play with the boss Sephiroth
the boss too strong
him just 4 hit can let me die
me kill him so hard
but i go youtube watch
there ppl so "geng"
i mean "geng" play cheat lah !!!
anyone can tell me how to finish the Sephiroth
anyone can teach me !!!
this video is form youtube !!!