The boss is called "Mobile 8" if I remember correctly. He shouldn't be a problem unless you have crappy magic, few GF and you don't have any of their useful abilities, nuff said:
1. mode - normal one, just hit his main body, the canons are no threat at all
2. mode - the side cannons will fly off the main body and they will counterattack if you attack them.
First of all don't use GF while you're fighting him in his second mode because he'll use counterattacks immediately and remember that you can't destroy the side cannons so aim for his main body. I hope you know that bosses and regular opponents level alongside you so levels aren't the most important factor in the game but it doesn't hurt to be on a high level. You're on disc 3 and in all honesty your opponent shouldn't give you a hard time but he does and the only thing that comes to my mind is that you're not prepared well enough.
OK, the first and most important magic that you should have is "Aura", the magic that will enable you to use Limit Breaks more often (that means that you can deal some severe damage with Zell, Squall, Irvine) and I don't need to mention that you can finish this battle in one move, if Squall by any chance uses his Lionhart (you should have his ultimate weapon by now, if not I recommend you to obtain it, I highly doubt that you'll have a chance later in the game) and Qustis Blue Magic can be more than useful (Mighty Guard and White wind are the best support spells in the entire game). Also some GF abilities prove to be more than useful, HP+60%, Str +60%, Auto Haste, Auto Protect...and such should come in handy. Casting Protect and Regen on your entire party should be of some serious help, GF Cerberus is most useful here because he enables you to cast magic three times in a row. The battle itself shouldn't be hard, you just need to have decent magic, abilities and Limit Breaks also help a lot maybe the most because you can break him in few turns. I have read somewhere in a walktrough that Odin can also kill this opponent instantly but I'm not entirely sure on this one.
I hope that I've been of some help.
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