Here are the three I plan on using for BW battle frontier team, I've used their untrained/unfinished versions so far and they are working well enough, but hard to tell if their final setup will be good or not.
Also never really battled much outside the main storyline, but i do know enough about breeding/evs/ivs/etc.
let me know of any suggestions:
Ability: Rock Head
Nature: -Spatt +att
EVs: HP and att
Item: Rocky Helmet or Leftovers, not sure yet
Heavy Slam - STAB
Head Smash - STAB
Nature: -att +spatt
EVs: spatt, spdef/def
Item: Big Root
Purpose: I usually use this guy when i'm struggling or have no type advantages with my other pokemon. Meant to hinder and stall.
Nature: -att +spd
EVs: spatt, spd
Item: can't remember/not sure yet
Purpose: Trying for a spatt sweeper with as much type diversity as possible to rely on type advantages.