I have a question, does anyone mastered the Job "Mimic"?
It takes 999 Ability points for Level 1 and thats pritty hard!
Yup - I mastered every job for every character to max out their stats. I waited to do this in the last screen of the N-Zone, where you can fight "Movers." Defeating them gives you a boatload of AP, something like 250 a pop I think, so accomplishing this task wasn't quite as daunting.
And another question: Which Level did you have when you reached the last boss? I have Level 40 with each char and he is very hard to defeat and training there doesnt bring me Xp only Ap.
I was at level 50, and it was still hard - took me 2 tries to beat him.

As for skills, $Toss works wonders on his final form, and believe it or not, so does DANCE!

Every character had 2-Handed, and I equipped each with a double lance in each hand. Then all the characters had Dance! and Mimic!
When a character got sword dance, it caused 9999 worth of damage with the lances. When this occured, I immediately mimiced the move with my other 3 characters, and they each delt 9999 to Ex-Death.

Once I discovered this he went down pretty quick, and equiping the characters with red shoes and prism dresses almost ensured they got sword dance every time.