Anotger reason: a lot of really Gen 1 were designed before they had the typings mapped out and they just gave them a plethora of moves. See the Nidos, Rhydon, etc.
"We live in a country Hasire.." ~ yosouf06
REVOLVER STAKE! http://img.photobucket.com/albums/v717/ChocoboMog123/AltEisenRChocoboMog.png