Blastoise (Japanese: カメックス Kamekkusu) is a Water-Type Pokemon introduced in Generation I. Blastoise is the evolved form of  Wartortle, and the final evolution of Squirtle. It's also the version mascot for Pokemon Blue.

Physiology

  Blastoise are large, tortoise-like Pokémon with some features similar to those of its pre-evolved forms. Blastoise has a large blue body, cream-colored stomach, small fat arms and legs, and a large brown shell rimmed with white, featuring its water cannons. It is now noticeably bulkier than its previous evolutions. Like its pre-evolved forms, Blastoise has a shell which covers its entire body, which it can also be withdrawn into. Contrary to Squirtle and Wartortle, Blastoise has large, water cannons that are located on the top left and right sides. The water that comes out of the cannons is capable of punching holes through thick steel.  

Natural abilities

  Blastoise, like Wartortle and Squirtle, can naturally shoot water, though not from its mouth, but from its large cannons. These cannons allow water to be shot at much greater force, which leaves them the backing force of all water attacks. From the spouts on its shell, Blastoise can fire water bullets with amazing accuracy. It can hit a target more than one hundred sixty feet away!