Smitty Werben Jaeger Man Jensen
Smash Apprentice
One day, Game Freak decided to go for some fresh air and go by the pond. Very bored for the lack of ideas that could be created, some random guy threw a rock across the pond. Amused by the effects of skipping rocks across the pond, another random guy exclaimed, "oMggg!! Rocks kan creayte ripples in da wateh, imagine surfin' rocks noa!". And with Rhydon having is line of specials, Surf was added, as well as a giant prehistoric rock monster thingy and the giant steal fatty Aggron. Sneazel was their one mistake, and they are all hitting themselves with martinis.............This doesn't explain the surfing rock phenomenon, though.
Edit:
You also never see them in Poke stadium and battle revolution...I guess Dugtrio has claws underneath the ground. But we'll never see them.