hr6 black gravios help plz

im having trouble with the hr6 black gravios and i cant beat it any armors or wepon sugestions plz help

I also had my problems with him. now the question is: Do you fail the quest because you die or because he doesn't?

If you have the second problem, i would recommend to just fight him in a normal way and when the last minute starts capture him.
else try with lance and GuardUp (so you can block the gas ant the beam).

use a ranged weapon. Range is so much easier than melee it's not even funny. Stay on the right (his left) and learn the spot where you can be to avoid his sweeping laser and it's a easy win.

i beat him with the ceanataur head axe

Ceanatuar head axe is indeed a great weapon :P

I'd say ranged is still a better idea though, as it makes his attacks almost effortless to dodge (especially his smoke attacks )