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I already posted an explanation and a video to explain it.
Clauncher is based on the pistol shrimp, a real world Pokemon.
It has a large claw that can clamp down so hard, it creates a bubble that collapses so violently, the implosion gives off a flash of light that is hotter than the surface of the sun and a resulting shockwave that can stun or kill prey from a distance.
Video of pistol shrimp: http://www.youtube.com/watch?&v=eKPrGxB1Kzc