This is an Alexandrite Map foe, intended to be solo'd, presumably by any class. It's not like you can tell in advance and change classes.

The Biclops itself is reasonable, big scary cyclops moves, alright...
...but then it summons 2 waves of about a dozen small adds, which all have a LOT of health for their sheer number.

If you are a Summoner, you're pretty dead, because you're class is incapable of any substantial AOE damage on more than a few targets, and WAY too squishy to stand there taking constant hits. (Your only hope is Titan limit break but, oh right, the cyclops can KNOCK Titan back causing it to be horribly out of position... on top of the fact that you have to dodge the boss AOEs yourself.)

Scholar? Dead, and even worse off.

Paladin... Dead without healer chocobo because, again, you have almost no AOE.

Ninja, Monk, Dragoon, Bard, probably all in rough shape simply because it takes quite a while to kill the lil guys, and a truckload of TP.