The obvious choices are Umbreon and Flareon.
Here's my idea:
Grab guts Flareon, train him until he gets fire fang and facade. Give him the toxic orb. It's like flame orb Swellow/Heracross, only so stupid no one will see it coming. Though, Flareon's attack is MUCH higher than Swellow's, and slightly higher than Heracross's, so this may work.
Fully-evolved Pokemon with guts:
Conkeldurr + guts + facade + flame orb = rape
Conkeldurr + sheer force + rock slide + life orb = rape (charizard edition)
GUYS WHY DIDN'T WE THINK OF THIS SOONER
(guts/facade/flame orb team)