I have an example: [I'll post this on "What is a good moveset for Shuckle?" too]
Brave nature
Gyro Ball
Rock Polish
Power Trick
Sand Tomb (If you send this out for a different reason)/Whatever you want here
This is the best I could come up with. Rock Polish gets you to an even lower speed rate, powers Gyro ball to epic power. Sand Tomb is when you have a different idea in Using this. Power Trick is pretty obvious.
Swagger. Confuses and numbs attack.
Alrighty guys, I'm going to go ahead and post the famous Shell Smash Contrary Shuckle.
Basically... for use in sand:
Shuckle @ Chesto Berry Trait: Contrary Impish Nature/Careful Nature EVs: 252 HP/ 128 Def / 128 SDef Moves: - Shell Smash - Rest - Power Swap
Contrary Shuckle can be one of the most infuriating dual walls when used correctly.
Works with a handful of natures, good with Leftovers for extra recovery