Create a set that does not use Leftovers or Life Orb as an item.
Serperior @ Light Clay
EVs: 252 Spd / 252 HP / 4 SDef
- Light Screen
- Giga Drain
I think it is obvious how a fast and decently bulky screener works. Taunt+ Giga Drain to prevent most Stealth Rock attempts.
Create a set that uses at least two non-attacking moves.
Exploud @ Leftovers
EVs: 164 Spd / 252 SAtk / 92 HP
- Focus Blast
- Hyper Voice
- Work Up
Perfect Coverage out of champion Shedinja thanks to Scrappy. Hyper Voice for reliable STAB move. Focus Blast complements Hyper Voice nicely by hitting all resists and fellow Normal-types hard. Sub to shield from revenge kill and protect you just in case that Focus Blast misses(lol always). Work Up to boost its special Attack and because it really doesn't need any extra coverage.
Max special Attack for maximum damage, fast Enough to outspeed standard defensive missy that will do nothing to you, giving you a free sub, rest is in bulk.