Final Fantasy XIII-2

http://finalfantasy.wikia.com/wiki/Metal_Gigantuar

TL;DR: It only uses 10k Needles. Survive 10k Needles (switching to Tortoise [SEN x3] is advised), heal, damage it. Repeat until dead.

I've started with triple ravagers for the first wave of attacks to boost the chain gauge. Then I switched to triple commando and barraged him with attacks. He usually died just before he reached "1"
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"A red flowering, a blue student, and spotted silver mushrooms?"- Meimei
"You hurt me and my friends, so I eat you for dinner!"- Quina

If we're talking full-powered teams here two rounds of COM/COM/COM, using Chichu as the monster, was all that was necessary for me

You're right. It only takes one round. Must have been thinking of something else.....maybe....

I'm pretty sure Chichu was not my mistake as much as it was my own memory since it was months ago when I had to worry about beating it for the bestiary