> Make sure you have Trick Room in effect
> Use this moveset on Shuckle
Shuckle@ Focus Sash (Brave, 252 Attack, 252 Sp. Attack, 6 HP)
Stone Edge
Earthquake
Substitute/Double Team
Power Trick
Strategy: Having Brave nature will make you most likely the last without Trick Room, Power Trick exchanges Attack with Defense, having the EVs in attack will make shuckle survive some attacks after a Power Trick. Substitute for no damage(apart from the 1/4) or Double Team for Luck.