[Xing*]

Skarmory @ Leftovers
Ability: Keen Eye
Nature: Impish[+Def, -Sp.Atk]
EVs: 252 Def / 32 Atk / 224 HP
- Drill Peck
- Spikes
- Roost
- Whirlwind
Standard Skarm. Some Atk EVs for Drill Peck, which can be handy to take out those Heracrosses. Roost for great HP recovery, and Roar to inflict damage with Spike/SRock. A few Speed EVs is possible.

Skarmory @ Leftovers
Ability: Keen Eye
Nature: Impish[+Def, -Sp.Atk]
EVs: 252 HP / 252 Def / 4 Sp.Def
- Spikes
- Stealth Rock
- Whirlwind
- Roost

Full out wall, no attacking move this time. And it's both a Spiker and a Stealth Rocker, self explanatory.

*Note Shed Shell is also an item of choice for Skarm, as it can help it escape Magnezones.