Ive heard on the internet, that there's a glitch which makes it so you can obtain final form before fighting Demyx. This is the requirement: "However, there is a glitch where it can be obtained before the fight with Demyx by continuously going into any drive form and quitting in Hades' challenge until he randomly turns into Final Form."

 

Im wondering if anyone can confirm this. That said, if this glitch is real, i need to know if it was fixed in KH2 Final MIx, considering how OP that glitch would be if it wasnt fixed.

No.. You are only able to get it after the roxas fight, if you don't get it anytime after that, then you go into random forms until you obtain it

You need more drive gauges anyway.

I never had Kh2 but It does sound like a real glitch....don't believe I've never played the game anyways