Shuckle doesn't have Shell Smash.
Shuckle's best set is still Wrap + Binding Band, add to the mix Protect, Toxic, and rest, and you'll be able to overstall a good bunch of Pokémon, or at least leave almost K.O any setup swepeer to try that setup on your face (protip: Encore rarely works as it needs gosh's like prediction power). Power Split's sets can also be used along with Wrap, as you can reduce to the half the power of your oponent, you can trap him, and you're not really prone at all to Taunt as you can just Rollout or Stone Edge it's face with your now usable offense, Power Split sets tends to forgoe Toxic and Binding Band on favor of Leaftovers and an attack. Any other set, incluided the one listed on the site, are pure joke sets than doesn't ever intended to make of Shuckle a viable option on NU, and the VGC's one is pretty decent over there.
I love Caterpie, he's a so adorable little bug! ♥ (Also, sorry for my English, I'm still learning it and I'm not a native speaker).