best movie ever

[Raditzu]

You couldn't get the Z Saber in X1. In the first game you just had to rule. That was, by far, the easiest Sigma they've ever made.

The saber came about in the second game, but just barely. Zero used it when you fought him. ;_;

In the third game, Zero gave X the saber when you met certain requirements. Something about how you beat one of the later mid-bosses. It was pretty badass. Killed any boss in two hits, including Sigma's final form. That, admittedly, was the only way I was able to beat Sigma: by using the saber.

EDIT: You could get the Dragon Punch in the second game and the Hadouken in the first game.