Mog's got a whole huge family though. Assuming they're already in the funhouse before the battle begins (how do they get in, anyway, with no exits?) they'd probably make it a battle of "Bugs Bunny vs. That Turtle Guy" proportions. "I just saw you over there! How'd you get in front of me!?" Ness 'd probably blame it on the mirrors or something, ensuring that at least a few Moogles can get off some decent spells (and do they have Espers equipped? Maybe not..)

And I wonder what one big massive Dance attack would do..?

(By the way, surely you remember the old Bugs Bunny cartoons where he was racing a turtle and the turtle called all his friends/family and confused the heck out of Bugs.. always appearing in front of him even though he'd staple the turtle onto a tree or something..)