Pawniard is a great Pokemon for LC, because it has access to a great, wide movepool, as well as having many resistances, and also being great for so many different things. Here's the set I use:
Pawniard @ Focus Sash
Ability: Defiant
Level: 5
Shiny: Yes
EVs: 156 Atk / 76 Def / 76 SpD / 196 Spe
Jolly Nature
IVs: 0 SpA
- Knock Off
- Iron Head
- Brick Break
- Stealth Rocks
The EVs and Focus Sash let is live a hit to set Stealth Rocks up, great in LC. Knock off is your best friend in competitive, and Iron head is for strong Steel STAB, nice flinch chance too, should you outspeed. Brick Break is for coverage against Ice, Normal, Rock, and other Steel types, and can break Light Screen and Reflect, although they're not always used.
Hope this set helps!