Blastoise is a Water-type Shellfish Pokémon.
Blastoise is the version mascot of the Japanese and international versions of Pokémon Blue, appearing on the boxart of both.
Blastoise is a large, bipedal tortoise-like Pokémon. Its body is dark blue and is mostly hidden by its tough, brown shell. This shell has a pale yellow underside and a white ridge between the upper and lower halves, which also encircles the arms. Two powerful water cannons reside in the top sides of its shell. These cannons can be extended or withdrawn and can be used to assist in high-speed charges. Blastoise's head has triangular ears which are black on the inside, small brown eyes, and a cream-colored lower jaw. Its arms are thick and striated with three claws on each hand. Its feet have three claws on the front and one on the back. It has a stubby tail.
As Mega Blastoise, it develops two smaller shells over its arms, each with their own water cannon. The two cannons on its back are replaced by a single, central water cannon of greater size. This cannon extends forward over Mega Blastoise's head and is said to have a blast range of over 6 miles. Its eyes turn red, and its ears angle backwards. It has a small point on its chin.
The powerful cannons on this Pokémon's back are capable of producing water blasts that can pierce steel and concrete. Blastoise deliberately makes itself heavy to withstand these powerful blasts, and it will crush its opponents with its bulk. The anime has shown that Blastoise can take the role of a leader in large groups of Squirtle and Wartortle. Its preferred habitat seems to be freshwater ponds and lakes.