If this is in the wrong place let me know, I apologize...

I'm playing FVII on the emulator, everythings going great until I meet this asshole Demon's gate. Now that I read about him he should be easy, however I have no Barrier or Right Arms, and have no way to get them now. My only choice is to hammer him with Behemut (once) and limit breaks the rest of the time, while at the same time drastically trying to heal everyone with Aeris. The best I can do is get him down to about 3000, but usually he just slaughters me quickly with a combination of moves including my favorite, the rock on the head, which nicely seems to cost exactly the HP I have left. I would hope my defense would be better, I hardly ever retreat from battles and I upgrade armor every time I get the chance. Do I have any chance of beating this douche like this, or what? Any hints would be greatly appreciated, and if anyone is up for the challenge and wants to have a go, let me know and ill send the memcard, for some reason I cant attach it here.

Thanks.