>>719734668
keep close to him, running and dodging is often more effective than trying to deflect
umbrella can be useful if you've got the fire upgrade, especially against that one fireball attack (not the third phase one) he does when he's got some space from you
when he jumps up just run away, and once he hits or is about to hit the ground jump up and grapple back onto him
use the anti-ghost whistle 3 times for an easy third phase
and use divine confetti, or if you don't have any at least the purple flame vent weapon buff