Isn't like slowbro devolved version of slowpoke. Slowpoke's evolution = A monster eating his tail and slowpoke gets fatter and stands up Quality pokemon evolution nintendo.
Actually no. Shelder bites on a slowpoke's tail making its tail heavier forcing Slowpoke to stand up. With its hands free it can use punching moves. Also Shelder's toxin removes Slowbro's ability to feel pain.