Oh, yes Shuckle. I enjoy sweeping in Ubers with Shuckle. Shuckle is NU for anyone who doesn't know.
EVs: 252 HP 28 Def/SpD 228 Def/SpD
Toxic badly poisons enemies. Rollout will deal with Steels and Poisons after boosting. Rest heals you all the way. Acupressure is amazing because it boosts a random stat(including evasion and accuracy) 2 stages. Rest heals you and removes status. For this set, have a Smeargle Baton Pass Ingrain to your Shuckle. This gives you more healing and prevents a switch due to Whirlwind, Dragon Tail, Circle Throw, or Roar. Smeargle because it is the only Pokemon with Ingrain and BP. Max HP to live longer. Defense and Special Defense should be equal at 553.
EVs 252 Def 252 SpD 4 HP
Power Trick makes Shuckle a glass cannon. Gyro Ball hits anything with a speed stat. Earthquake hits hard and combines well with Stone Edge for coverage. For this set, you want an ally that can use Trick Room or one that can Baton Pass a Substitute and put the opponent to sleep. That means Smeargle, Drifblim, etc. or anything that can learn Trick Room, has good speed, and learns Baton Pass. The Substitute tactic gives you a free turn to KO something. Sleeping opponent might give you another free KO. Sturdy means that at full HP, you will always live through a hit with at least 1 HP, giving you another free KO. Quick Claw gives you extra KOs. Trick Room strategy works by making Shuckle act first. This means that wile you are in Trick Room, unless the foe knows a priority move, you get free KOs. Either tactic can be devastating.
I EV train, I breed for moves, and I breed for IVs. I have a shiny Lillipup which will be a Sand Rush Stoutland in my future Sandstorm Party. My first fifth generation EV trained party is Chandelure, Carracosta, Ferrothorn, Musharna, Braviary, and Krookodile. I am planning on making Hail, Rain, Sun, and Sandstorm Teams. On a somewhat related note, Shuckle is awesome.