there is a monster that gives you ethers but i cant rember what it is besides you can leve momoria befor you get to kuja. daugareegoos sysnasis might give you em but i just bought loads of thents and went back to the save point after every boss timat is easy use flare and holy and odin with odins sword and get zidance trance up befor the battle and you shuld win in no time if you got the mp of corse or just level up lots i suggest being 60+ when you fight him.