Furret and Raticate, actually. At least in game. I once used both on a team in HG, and they kicked ass. Even though Furret only knew HM moves, it always outsped my opponents and did major damage, especially once I taught it Surf. Raticate gets Sucker Punch, Bite, and Hyper Fang all before it even evolves, and Crunch comes soon after. Dark type? Who needs a Dark type? My Raticate is in the top percentage of Raticates!