Shuckle's been one of my favorites for a long time, and it seems Gen V has given him enough random improvements to be usable outside of sets that mainly rely on Evasion/not really doing anything. The problem is it's still really hard for him to beat anything, especially since if whatever you've used Power Split on switches out, you're left with three moves. Outside of Acupressure and possibly Toxic, he doesn't have 4 move slot syndrome as situational moveslot syndrome - stuff like Knock Off, Power Split, Gastro Acid, Gyro Ball has the potential to be pretty powerful. Add in a type combination that Defensively leaves him either neutral or weak to everything that matters it's really hard for me to find a real use for him.
Right now I'm thinking about using a Sturdy Shuckle in combination with WishPass Vaporeon and Hippowdon as a defensive core, basically with the idea of using Wish+Sturdy to guarantee against almost anything that Shuckle's gonna live forever, since Wish can be used to constantly reactivate sturdy. My main problem is figuring out how beyond those three living forever I can cause real damage to my opponent, asides from rage quits from battles lasting forever.