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Raticate is my Karren-Fag bro.
The above posters pretty much have the right of it.
I prefer to run
Raticate @ Flame Orb
Ability: Guts
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Facade
- U-turn
- Sucker Punch
- Protect
and then bring him out late game to clean up after rock and steel types have been taken out.
Alternatively if you have a baton passer or another U-Turner/volt switcher, you can run super fang in the last slot to bust up HP walls.