So, I did poke holes at Zeromus EG, and for good reason.. here's the other monster that I simply don't fear.
One of the major series of attacks this monster does is a tricast attack off Reflect status. Ordinarily, this attack on pretty much any character with elemental absorb (and resistance) is pretty much a killer since the monster has an insane magic stat. However, the monster itself is not a threat once you realize that 3 particular characters with elemental absorb are nearly invincible in a solo combat type of match.
1) Cecil - Caesar's Plate, a lesser known aspect of this armor is Holy protection, which seems kinda useless since a small number of enemies use it (Protophase, Wicked Mask, Zeromus and this monster uses it). So, if for any silly reason that Holy from the Lightbringer is reflected back onto Cecil.. a Hero Shield combination makes him virtually invincible.
2) Rydia - Rainbow Robe, a robe that provides all the magic resistance a mage needs is epic.. plus the Dragon's Whisker will make mince meat of of the Brachioraidos. Why use a summon that makes that beast even meaner? Quake's quite handy too.
3) Edward - Vishnu Vest... that might be the only thing that gives Edward a decided edge of many other guys since it has the same resistances the Rainbow Robe has, which is amazing considering of his lack of useful commands (even Chant sucks IMO). Pair him with a working Loki's Lute (Euro version only) or the Apollo's Harp, and you don't even have to abuse the lame "Psycho Edward" bug.
Besides, there are a few other characters that are truly handy, like Kain with his overpowered Abel's Lance which Tornado relies on level to execute frequently. Since the boss is at level 85 naturally, it's easy to harvest those overpowered Hero Shields when you really want them.