I have every one of the Hunts completed except Yiazmat and Omega Mark XII. Actually it's been so long since I played FFXII that I can't remember exactly, but Omega Mark XII isn't acually a part of the Hunt is he? I'm pretty sure he's only just a side mega-boss.

Yiazmat though I have down to about 13 million HP left from the last save point I stopped at. It's not much compared to the 50 Million he starts at, but this is where he is absolutely crushing my party members and I'm retreating to heal A LOT. I do need to get back and conquer him to complete the Hunt 100% though.