Zodiark is a mega pain. He becomes immune at like 10 or 15% health.Looking at the trophies I have, it looks like I beat Ultima but not Zodiark. I remember the fight being a huge pain in the ass with constant AOE and debuffs that I couldn't react to while still doing damage. Rough fight!
I have absolutely no memory of weapons in that game and how you got them. Knowing me, I probably did whatever was necessary to get the best weapons before going after the high level espers and hunts. But, if any of them were really low drop rates or something maybe not.
A lot of them had low drops rates in the OG, and it was time consuming. Kinda like beating Yiazmat