it's impossible to get to lvl 100 in kingdom hearts 2 unless you copy of the game has a glitch that lets you go above lvl 99.
note-
99 is the max normal lvl.
7 is the max lvl for summons and "forms."
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The official strategy guide only shows up to level 96. It takes a good deal of dedication. In order to obtain that quantity of level ups, you will need to fight about every foe that crosses your path. There can't be any running away from battles. You will also want to seek out the hidden bosses such as The Phantom and Zisa.
If you're talking about the first Kingdom Hearts, a good place to go is End of the World. If you're talking about the 2nd Kingdom hearts, a good place to go is The World That Never Was.
try to hit as many targets as possible and collect as many orbs as possible before time runs out. GOOD LUCK!
The best way that I leveled up was doing tournaments in the Olympus Coliseum. The final bosses like Leon and Yuffie, Hercules, and Hades, they give you tons of EXP.
Short answer: 2,875,578. That's what I needed and I picked the shield at the start. It may be different depending on what you select at the start, but that's the best I can say.