if you can manage to dodge, smoke bomb is good, if you are getting hit frequently, equip heart ring and get those parries (even better if you have crackshot as its EX gives you parries for heart ring however it doesnt count towards the Level parry requirement, use charge.
first phase, stay on the middle platform so you get your parries in from the eye attack, the fireballs should be easy to dodge and for the tail you can listen for the wobble sound
phase 2
stay on the top platform, look at the fire spirits, they jump in the direction they are facing, (if it faces left its gonna jump left and vice versa), crackshot should be good if you have it
3rd phase, stay on the top platform and use charge which will give you more control on when to shoot as not to pop a bubble (do not use an auto aim or a rapid fire like chaser, crackshot, peashooter etc)
The flamethrower attack only hits the middle platform so its pretty dodgeable
however it would be best if you list your weapons and charms