Rhydon

Rhydon is a large Pokemon with a tough rock hard shell. It is the evolved form of Rhyhorn. When evolved, it becomes a biped, its rock hard exterior changes, including its horn and grows a tail. Rhydon is incredibly powerful and is fully immune to electric attack. In the generation that introduced abilities, it has Lightning Rod which enables all electric attacks to be pulled towards it. This ability can be very useful in multi-battles.