Ok go to the underground of disneyland then attack the main generator with thunder attacks then a platform will be available.And lastly get all treasures in there(there will be 3 stages available.The clock tower,the pinball and the rooftop.)
You need : Tornado x1 Mine Square x1 Once More Seconds Chance
Be sure place Tornado your first deck, at first of battle begin, cast Tornado quickly and use's your analog stick to locate Tornado toward Vanitas, and see how much his HP decrease. After that, keep dodging, until Vanitas unleas his circle attack with round crystal which darken your PSP screen, notice vanitas walking toward you? Cast Mine Square which explode him into mid-air, quickly again cast Tornado, and his HP will depletes to last blink of it. Tornado can't finish him, so locate your tornado to another mine square remaining, and when Tornado end, Vanitas fall to the mine and end of story. (Someone pliz place a video, though I don't know how to do it.)
Each Main Character Strongest Weapon beside Ultima Weapon and VG
Added 17 Jul 2011, ID #4044
Ventus = Lost Memory STR+6 MGC+5 Obtained After a talk with Vanitas in Destiny Island Aqua = Stromfall STR+5 MGC+4 Obtained After meet sora and Riku in Destiny Island Terra = Chaos Ripper STR+10 MGC-2 Obtained after defeat master eraqus in Land of Departure P.S Terra can't equip Chaos Ripper in Final boss Battle, instead he have to equip End of the Earth (STR+5 MGC+3)
This works smoothly with Aqua and Ventus. Not as good with Terra.You need 3-4 mega flares.To make these mix fission firaga and crawling fire at level 4,max level.Mix a abounding crystal with it to get exp chance or shimmering crystal for fire boost.After you get exp chance, get you hp down to 25% or less. Go to radiant garden to the place where you fought the Trinity Armor. Go to the middle. There this will spawn enemies. move next to the exit then use mega flare. Then another will spawn. Use another mega flare. After both rounds died, you will get 1.6k experience. You get 3k exp if you beat the game with all 3 characters though. Good luck!
Here's a quick tip to defeating Vanitas's lingering spirit in The Badlands.
Make sure to have these Commands and Abilities: Once More Second Chance Attack Haste X1 or x4 Curaga X1 Lvl 4 Strike Raid X7 lvl 4
At the start of the battle, attack Vanitas and cancel his first move. Then dodge roll to one of the two large rock formations and make sure Vanitas is running at you from the other side of the rock(You'll know your doing it right when he's on the other side of the rock and isn't attacking you) lock onto him and use strike raid on him. By the time you get to your final one, the first one should be finished reloading. Repeat until he defeated. Depending on your level, this might take a while. Also, he will run around the rock at times, so just run the opposite way and you should be fine. : )