Well, the good things are taken already, but I'll try something out. Use at your own risk of Focus Miss...
Emboar (M) @ Leftovers
Trait: Blaze
EVs: 32 HP / 140 Atk / 252 SpA / 40 SpDef / 44 Spe
Nature: Mild
-Substitute
-Flamethrower
-Focus Blast
-Wild Charge
44 Speed EVs let it outspeed min-speed Poliwrath, which is nice. 32 HP gives it a lefties number. 252+ SpAtk lets it smash things around. 140 Atk is all it needs to get the job done against most anything, it seems. It could be boosted for threats like Sigilyph, I suppose, but it seemed a good benchmark, doing enough to 2HKO Slowking 94% of the time after Rocks. The remaining 40 are stashed into SpDef, since Emboar has some decent bulk and ok resistances to Fire and Ice. It doesn't help the substitutes survive much, but they can survive Stallrein's Blizzards, Weezing's Thunderbolts, and an unboosted Stored Power from Sigilyph. Minor benefits, really. The only reason those EVs aren't in Speed or Atk is because more Atk doesn't net much difference, nor is there anything notable within reach speed-wise.
252+ SpA Emboar Focus Blast vs. 232 HP / 4+ SpD Walrein: 84.96 - 100.23%
252+ SpA Emboar Focus Blast vs. 252 HP / 252+ SpD Druddigon: 38.82 - 46.08%
252+ SpA Emboar Focus Blast vs. 216 HP / 0 SpD Druddigon: 56.16 - 66.47%
252+ SpA Emboar Flamethrower vs. 252 HP / 64 SpD Spiritomb: 41.44 - 48.68%
252+ SpA Emboar Focus Blast vs. 40 HP / 216+ SpD Lanturn: 39.9 - 47.13%
252+ SpA Emboar Focus Blast vs. 40 HP / 216 SpD Lanturn: 43.64 - 51.62% (Lanturn better not be running less specially defensive than standard)
252+ SpA Emboar Focus Blast vs. 252 HP / 252+ SpD Quagsire: 42.89 - 50.5%
252+ SpA Emboar Focus Blast vs. 252 HP / 4 SpD Poliwrath: 50.78 - 60.15%
252+ SpA Emboar Focus Blast vs. 252 HP / 0 SpD Qwilfish: 43.11 - 51.19%
140 Atk Emboar Wild Charge vs. 252 HP / 240+ Def Qwilfish: 45.5 - 53.89% (if behind a sub, ergo no intimidate)
140 Atk Emboar Wild Charge vs. 248 HP / 144 Def Slowking: 45.29 - 53.43% (94% chance to 2HKO after Rocks and lefties)
140 Atk Emboar Wild Charge vs. 248 HP / 0 Def Slowking: 53.43 - 63.1%
252+ SpA Emboar Focus Blast vs. 252 HP / 4 SpD Alomomola: 62.35 - 73.59%
140 Atk Emboar Wild Charge vs. 252 HP / 252+ Def Alomomola: 27.34 - 32.2% (enough to combine with Focus Blast and get the 2HKO after Rocks and lefties)