Their enormous claws launch cannonballs of water powerful enough to pierce tanker hulls.
– Pokémon X Pokédex
Clawitzer is the evolution of Clauncher. It is exclusive to Pokemon X, and the equivalent of Dragalge. It’s based on a pistol shrimp with its exaggerated giant claw.
Its ability, Mega Launcher, is shared with only Clauncher and Mega Blastoise. It boosts the power of aura and pulse-based moves (and boosts healing of Heal Pulse). There are six moves affected by Mega Launcher, and Clawitzer learns 5 of them (the sixth is Origin Pulse, which is exclusive to Kyogre).
Stat-wise, it has good Sp Attack, and decent defenses, but is slow. The Kalos Elite 4 member Siebold has a Clawitzer, but because it’s so slow it’s never given my any problems.