Diffusion Beam

Diffusion Beam is the name of R.O.B.'s Final Smash in Super Smash Bros. Brawl. Once the Smash Ball has been opened, and R.O.B. activates it, swirling lasers will come out of his eyes dealing a lot of damage, but does not have any knockback. These lasers do not reach out as far as R.O.B's Robo Beam.

Super Smash Bros. Brawl Trophy Information
''R.O.B.'s Final Smash. He emits a beam from his eyes that spreads across the spectrum and undulates in great variety as it travels. What makes this technique different is R.O.B.'s ability to move while using it. This allows him to use it in combination with his other moves to increase his Final Smash's effectiveness.''