How do you beat the psychic guy in City park on super power island?

Sir Rebral will throw rocks at you with his mind power. Make him hit himself with one (jump up near him while a rock's coming at you). He will get mad and begin yanking up chunks of the ground to hit you. Slide the rock from the right side (near the restroom) over toward him, just a bit right of directly under him (between the statue base and the bench). When he yanks up the ground, the rock will hit him.

If you miss, you will need to recover the rock to try again.

Cuff him and you will get credit on your Superhero ID.