No shit!! I cannot beat Deus, I have tried like five thousand times. And I ran outta cash and stuff to sell, just to upgrade my main party's Gears, so I can't really use the other characters to do away with those orbs... The foul thought of employing the use of a gameshark has crossed my mind more than once lately.
What are you? an RPG newbie?
If you want a hint, keep fighting in the lighthouse before Deus... Easy cash, easy upgrades, east level ups... Just make sure you don't die though... some critters can knock down a Xenogear with a few hits.... which is pretty scarier than Deus considering that those things are NORMAL enemies...
I leveled up for about 4 hours in the lighthouse, so I beat Deus in about the 3rd try.... It ain't that bad...