Billy McBoberson is a minor character in the Litle P and Sandslash Series. He is usually blamed when the Amigoes steal something. In one adventure, he is revealed to be a Metapod, once a Caterpie.
He is pretty much the stereotypical nerd. He, unknowingly, has a rivalry in Litle P, since he stole Litle P's coloring book in kindergarden. Squirtle actually stole it.