In the first story, Alex finally achieves Final Form with Sora and Riku as the others, and defeats Xemnas.
In the second story, Joumae destroys the sentient Anti Alex and allows Alex to turn to Final Form to defeat Dilan.
In the third story, Alex uses a shard of the Epoch to transform his Lightning Guard into the Time Fracture, giving him his first completely unique skills that he uses to take down Aeleus, though Ed deals the final blow.
In Dark Renegade after JoumaeCurbstomps Alex. Jak and Daxter prove themselves to be some seriously hardcore Badass Normals by fighting him and winning.