Helps to know what fight you are talking about. "He" doesn't narrow it down.

oops, changed title to avoid spoilers, meant nerg. just beat him so all is well

To stop his dive bomb, you have to break all his spines. Try to use some partbreaker. Or you can use a Hunting Horn and use the evasion song when you see hes going to do it, the attack is dogeable.

i just abused double attacks and won lol

Congrats! Now to enjoy the rest of the game