Blastoise is a large, bipedal turtle-like Pokémon. It has a dark blue shell with a pale blue underside and a white ridge down the middle. Its head is large with a blunt snout and a slightly lighter blue face with thin, white whiskers. Blastoise's arms are thick and muscular with three claws on each hand. It has a stubby tail and two powerful water cannons on its back. Overall, Blastoise has a formidable and imposing appearance.

In the Pokémon series, Blastoise is the final evolved form of Squirtle, one of the original starter Pokémon. Known for its immense water cannons on its back, Blastoise is a Water-type Pokémon known for its strength and defensive capabilities. It is a popular choice among trainers for its versatility in battles and its iconic design. Blastoise is often depicted as a powerful and loyal Pokémon, ready to protect its trainer at all costs.