First moveset!

Stealth Rock hits every pokemon that comes into battle. Add Sandstorm, and you get good extra damage and a nice spec defense boost so Shuckle can take special moves well, and throw in Toxic to ensure some good stalling time and damage. Knock Off is to get rid of opponents item for good! Try using this moveset and strategy when using Shuckle!

Why 252 in HP instead of the expected 252 defense and spec defense? If shuckle has good defense and defense but low HP, he can easily get knocked out if not used properly!
Try to make his HP as high as possible by putting in 252 hp evs, and try to let him have higher than 20  IVs in hp and 15 IVs in defense and spec defense and give him Leftovers to ensure he stays in battle for a while!

Natures: Since Shuckles Def and Spec Def Base Stat is both 230, I would use a neutral nature unless you want defense higher than spec defense and vice versa!

Thanks for viewing!

