FusionDex.org

Schools of Magikarp often integrate Shellkarp into their ranks for aid in survival. While unable to swim as quickly, Shellkarp's tough shell means hunters will waste time futilely trying to prey on it while the Magikarp flee to safety.

Its swimming muscles are weak, so it is easily washed away by currents. At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep.