
Originally Posted by
Kraleck
One huge reason why Special-based Smeargle and Liepard Sets benefit greatly from Foul Play. Timid, Modest, Calm, and, especially, Bold are the biggest Natures to aid Swagger + Foul Play, but Shiftry has Sucker Punch (4th Gen Tutor), Fling, Payback, or Faint Attack with plenty of Attack of its own to not need Foul Play.
Fling can pair well with Pickpocket, especially with Flame Orb or any other Status Inflicting Fling Item. Flame Orb is the one to come to mind first because Pickpocket requires Physical Contact - something Burn can soften the impact from, short of a Physical Fire Type.
Counters
-Heracross has, by far, the best chance among non-Steel Types. Since Shiftry is weak to both of 'cross's STAB Types, quad weak to Bug (i.e. Megahorn), and 'cross resists both of Shiftry's STAB Types, 'cross is a definite pain in Shiftry's trunk. However, 'cross must beware of HP (Fire) during Sunny Day/Drought conditions.
-Steel Types - See Heracross's entry. Also beware of HP (Fire) in Strong Sunlight.
-Dark Dual-Types of the Fire, Poison, Steel, and Grass variety also resist both of Shiftry's STAB Types, but must beware of Brick Break, Low Sweep, Low Kick, and Focus Blast.