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Photon Blast is an energy sphere version of the Photon Wave attack used by Dr. Gero as Android 20.

Android 20 holds out his hands and fires a purple energy sphere at the opponent, inflicting massive damage.

The attack is called Energy Discharge Blast in Dragon Ball Z: Super Butōden. It was named Photon Blast in Dragon Ball Z: Supersonic Warriors 2, where it appears as one of Dr. Gero's super attacks.