Dude, Sentret is truly one of the best pokemon in the game. He's not that good as Sentret, but you evolve it into Furret and teach it Headbutt and Shadow Claw, that pokemon will rolfstomp anything that gets in it's way.
I beat the entire 4th gym using furret alone, he was underleveled and still beat the gym leader without going into the yellow.
Linoone is a badass. I used one in a Ruby Nuzlocke. Shockwave, STAB Headbutt, Blizzard, and something else (I think Rock Smash?). Way more useful than he looks. --- Pokemon Black- FC: 0003 3185 8262 Monster Hunter Tri, ID:71YAXZ -EU Server!