Hehe. Shuckle's Defenses are GIGANTIC, so Swagger will help Shuckle.
Shuckle @ Lum Berry
Nature: Hasty (+Speed, -Defense)
-Swagger (SUPER ULTRA GIGA IMPORTANT! Will maximize the foe's Attack, so Bide's useful)
-Bide (Lower defense for Shuckle means that can do a greant quantity of damage)
-Toxic (Stall, stall. Toxic's very useful in every single turn)
-Stealth Rock (YES! Entry Hazard moves are very useful on Shuckle, 'cause of its Attack)
YEAH! A Shuckle that can Stall, give an Entry Hazard and Bide more = EPIC SHUCKLE!