Oh he was soo difficult for me the first playthrough. However I altered my strategy for the second playthrough. What I did differently is I did enough hunts to bump my ranking up to get Nihapaloa, and collected LP galore. Nihapaloa + remedy on White Mousse, or any of the hunts knocks them down a few pegs. Or you can just hope that your status effects land on him which is what I did the first battle while he raped my face. It's really up to you but that is what worked for me.