its easy. u do the speed kills so often until he loose all his armor. Than he flys up and there you can jump on some stones he positionated.. There you ahve to be carefull because he attacks you always from above you so. Be always in movemen move up to him and there (i think) you can hit him. I have to try this now ^^ i went so far but not longer.. at this time he has perhaps 1 1/2 cm life left. So it wont be really long anymore to kill him =). Good Luck.
BtW before he pulls down some of the colleseum to use as mines, when he attacks you role on the side and hit him 1 time w8 a sec then hit him again and so on.. you wont loose any life (if you can role back well when he throws the statues on you
So keep on buddy u can do it