Banish spells tear this guy up also. I eat goblin mushpot and stack on MND gear. I can take him down as a WHM by myself in no time spamming the Banish line (Banishga II does around 600 damage alone) with my PLD friend keeping him busy. You don't need SMN's for this. I've gone with a SMN and I've killed the thing before the SMN even has a chance to resummon Ifrit for the second time.
BTW, Stun doesn't do crap on him. Went as PLD, DRK, WHM once. You can stun the self-destruct, but 2 seconds later he'll just ready it again.
Edited, Thu Apr 6 12:05:42 2006