How do you beat vreedle brothers in ben 10 alien force vilgax attack in ds

First, you have to get between Boid and Octagon. When Octagon is about to shoot, dodge the beam, which will paralyze Boid. While Boid is paralyzed, attack him. Repeat this process until Boid is defeated (Octagon hasn't been defeated yet). Octagon will then fly and shoot electrical projectiles. Block or dodge them, and whenever the time's right hit him repeat the process until he's defeated, too.