To beat the final boss in FFXIII use the 3 girls as your party, have Vanille as party leader equipped with a maxed out Malboro wand [or whatever name it becomes as a final weapon]and just caste status ailments and most importantly poison over and over as that's the only thing is susceptible to, while the other two slash into it, best if they both have maxed out Genji Gloves and their strongest weapons.
I tried twice before I eventually beat it, but when I did beat it I managed it with 5 star ranking and without needing the time bonus of the Gold watch.

Staying OT,what grinding my gears today is.....
Well not really grinding my gears, more of a WTF, I wasn't expecting that sort of situation.
Not having worked in a while, then getting a casual job where I was told I would get around 3 shifts a week , which was OK by me , instead after my first shift the boss came up to me and said, today was a unusually busy day [ I breezed through it ]and "I've done a roster" and I find out I've been rostered on for about a 60 hour week.
It's going to be a bit of a shock to the system, but very nice $$$