Quote Originally Posted by Vaan1980 View Post
Does Yiazmat gain health if you leave the colosseum and heal up and resurrect deaders and then go back in or only if you stay in the area with him?
Only if he's got Regen status on when you try to leave. You can leave and come back as many times as you like (for me, it was something like 34) but he won't gain any health unless he casts Regen before you leave. He usually starts the next fight with all the buff on again, so you'll need to Dispel him again...
Speaking of which, he usually varies his strategy each time you come back to fight him some more.
Does anyone think that I should have one physical attacker equiped with the bubble belt/masamune or go with genji gloves/masamune combo? Because I've got 2 masamune's, the tournesol, the excaliber, zodiac spear and 1 bow.
Bubble Belts are great for this fight. The Cat-Ear Hood can be very handy too. I personally used two close-range attackers and one at long range (the party leader, who I controlled in order to prevent them getting too close to Yiazmat). Masamune + Genjii Gloves or Cat-Ear Hood is good for getting big combos.
While it's tempting to keep buffing up your party during the fight, it's best not to bother. Simply have everyone's gambits set to keep the team revived whenever they fall; though if you give everybody all the buffs before entering the fight, things'll be easier at the outset.
Using Lure and Reverse on your fastest attacker can help to make things easier. It takes a lot of MP to keep those buffs in place, but it can draw a lot of fire away from other team members. Reverse becomes almost essential near the end of the fight, when Yiazmat starts using his ultimate attack, Cyclone, a lot.

Yiazmat's weak against Dark, so Dark-elemental weapons are good. Black Robe armour increases the power of Dark weapons (even though the game doesn't tell you this), so it can he useful.