Gen 5 OU Team (My personal favorite)

[JuJuLian]

Conkeldurr @ Life Orb  
Ability: Iron Fist  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Drain Punch  
- Mach Punch  
- Thunder Punch  
- Ice Punch  

Volcarona @ Lum Berry  
Ability: Flame Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Quiver Dance  
- Bug Buzz  
- Fiery Dance  
- Giga Drain  

Sigilyph @ Flame Orb  
Ability: Magic Guard  
EVs: 252 HP / 4 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psycho Shift  
- Cosmic Power  
- Stored Power  
- Roost  

Jellicent @ Leftovers  
Ability: Water Absorb  
EVs: 252 HP / 4 SpA / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Scald  
- Taunt  
- Will-O-Wisp  
- Recover  

Ferrothorn @ Rocky Helmet  
Ability: Iron Barbs  
EVs: 252 HP / 152 Def / 104 SpD  
Sassy Nature  
IVs: 0 Spe  
- Spikes  
- Gyro Ball  
- Leech Seed  
- Stealth Rock  

Garchomp @ Life Orb  
Ability: Rough Skin  
EVs: 252 Atk / 4 SpD / 252 Spe  
Timid Nature  
- Earthquake  
- Swords Dance  
- Outrage  
- Facade  

 

(Any improvements/tips would be greatly appreciated since im still quite new to pvp competitive teambuilding)