You found a Blastoise!
Blastoise, known in Japan as Kamex (カメックス Kamekkusu?), is a Water type Pokémon species in Nintendo and Game Freak’s Pokémon franchise. Created by Ken Sugimori, Blastoise first appeared in the video games Pokémon Red and Blueand subsequent sequels, later appearing in various merchandise, spinoff titles and animated and printed adaptations of the franchise. It is the final evolution of Squirtle, and next evolution of Wartortle. Its name is a portmanteau of the words “Blast” and “Tortoise”.