No matter how many times I try to defeat him, I lose. I find this battle quite impossible for some reason. All of my characters have levels of 75 onward, am I doing something wrong? From the moment he uses his Big Bang technique at the very start of the battle, he quickly destroys my party. I've used all the Grimoires on him also to get a couple extra hits in but he quickly transforms back into his good old self and beats the crap out of my characters.