It's SDef is high enough. You have rest. Also, in VGC if they can catch on they can double team your Shuckle enough and kill it before it can set up. However, I respect your want and will add it to my list, but I can't guarantee it will get done by Spring Regs if you go. Also, if you don't actually need a 31 SAtk IV, which I am assuming you don't, that would make it much easier to finish sooner.