Shrocker -- Rock Turtle Mountain/Aqua Type It lives in water, but can survive on land by using it's rock-hard shell as an oxygen tank. People aren't sure if Shrocker adapted to be like this or was like this from the start, but old cave drawings depict Shrocker on land with their shells.
It's name comes from the words "Shock" (because it's very shocking to see a water-dwelling creature on land) and "Rock" because of it's rock-hard shell.