Rolycoly - the coal pokemon

So I am actually pretty proud of how I messed with this little fella. I like to think that the ball of coal is like emergency food as they continue to forage for red coal. As they get bigger they start to eat the coal they used as a wheel and start to walk on there legs. Normally with this process they evolve as by this point the coal wheel has get enough nutrients that spur on leg growth.

The red on it's head is more like a vent as well as a trick against predators to make sure it seems to be always watching.