Actually, Freeze is what helps you survive the Ansem fights. When you select it when it comes up, the Guardian picks you up and holds you in the air for a few seconds. If you don't press Freeze when it appears, the Guardian will hit you invisibly.
The downside to pressing Freeze is that it allows Ansem damage you if he's too close, but if you wait until he's far away before you press Freeze, you'll receive no damage. So basically, while the Guardian is attached to you, lock on to Ansem and keep as far away from him and PRESS FREEZE whenever it appears.