you're probably allready past him by now but.

1. [between phase] between his attacks he will walk arround or stare at you or something like that. just shoot him with ebony and ivory.

2. [jump phase] he will jump into the air and try to land on top of you. jump into the air as well and use the handguns so he will hit the ground first. use this opportunity to slash down at him like the ending of the high time combo. (this will do damage if you land it right)

3. [pillar phase] he will ram his head into the ground and start summoning pilliars of fire to attack you. just run arround to dodge these. you can also use this time to get close and stinger him when he brings his head up. (note: stinger will throw him off balance)

4. [fireball phase] he will shoot fireballs at you. (note: you will see them forming in his mouth) when you see this stinger him and the fireball will blow up inside of him. this way is easier to do than trying to knock the fireballs back at him as long as you know the reach of your stinger.

5. [powerless phase] if you were successfull in part 4 his body will turn black and he will just sit there. pound on him until he regains power.

if you keep your distance in the tween phase you shouldn't have to worry about him attacking you with his claws or his tail. but if he does block his head with his claws and run towards you just jump over him and use the falling slash and jump back off again.

this may not be the most stylish way, but it gets the job done more often than not.