Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Something I have found incredibly underrated in OU play is:
Medicham @ Choice Scarf/Choice Band
Trait: Pure Power
EVs: 252 Atk, 252 Speed, 6 HP
Nature: Adamant/Jolly
-Hi Jump Kick/Drain Punch
-Psycho Cut
-Ice Punch
-Thunderpunch/Bullet Punch
This thing hits like a truck. I use it all the time...