How do you get ultimate form in Kingdom Hearts 2

First, its final form, and u need to have master form, and u go into World That Never Was, and at a place with nobodies, u drive, its a lucky thing so u need to try quite lots



Ok I'm not here to argue with anyone but I'm just saying that I got my final form at the Space Paranoids so you don't necessarily have to go to the World That Neve Was so idk where everyone gets this from. And as for ultimate form, I've heard of it, but idk.