Im trying to create a good shuckle sweep team and I dont know if I should use big root or leftovers on my shuckle (i have a smeargle with aqua ring, ingrain and baton pass) I'm playing x and y
Use Leftovers, Big Root only boosts the HP recovered from draining moves (Leech Life, Giga Drain), which Shuckle does not use.
Source: Knowledge.