The easiest has to be Axel. Once you have his attack patterns down he can't even touch you. Plus Oblivion and Oathkeeper are the best keyblades!
The hardest was Luxord *the card guy*. I just kept losing because my brother was screaming "YU-GI-OH!" everytime he passed my room. After that I beat him with ease though.
For every bar wasted your total summoning experience to level up goes down by one.
I go to Olympus and go to the Underworld. You have to have completed the Cerberus challenge to do this! You must also have the summoning "Chicken Little" to do this also.
Go to the nearest place you can fight and summon Chicken Little. Go down to "FPS Mode" and click it, it takes up two-three bars and you can exit it and repeat. After you have wasted your whole drive gauge go back to the Pain&Panic. Click on the one that lets you enter a tournament and click "Cerberus Cup." After you have entered it, exit out. You should have a full drive gauge bar. Repeat as many times as nessecary.
It would show people who haven't played Final Fantasy before a new game that they can experience.
In my opinion though, they shouldn't have added Auron. Everytime I heard the line "This is my story and you're not part of it." I felt my stomach drop. They should add Zell and Irvine. They can be the new "immature squad" of Kingdom Hearts.
It was a lot of fun to watch Irvine mess with the girls and to watch Zell try and get a hotdog. They can really expand on those two characters and make them even better.
Maybe Squall (Leon for you people who haven't played Final Fantasy VIII) decided that he wasn't the only one who should have a scar across his face like that. So he decided to give one to Saix?