Who do you get Wisdom Form in Kingdom Hearts 2?

What I did was go to Space Portal (I think it's called) and where the little drive-off carrier is you go in there and when you battle turn into a form. This doesn't work for Final Form though, because it only destroys Nobodies instead for getting experience, you need to go The World that Never Was to level up that form. Once you are in battle quickly finish the battle, then go back in the carrier. (Do not invert from the form.) I believe you invert automatically and you have full gauge again.

Hope this helps and works!