>>22741358>Fur coat is possible the most broken ability in the gameNot really, doubling a stat with an ability translates to an adjusted base stat between 2n+18 and 2n+49 depending on investment. Base 70 would become equivalent to base 158 to base 189, which sounds like a lot, except (Mega) Steelix and Mega Aggron already exist and are decidedly underwhelming.
>>22741162 fails to account for the fact that a) that's not even the most powerful physical Fighting move in the game (Mega Medicham's HJK is stronger); b) a 2HKO is just as impossible to switch into as an OHKO unless you're faster; c) Sword's Dance and Hazards exist, and d) so do Mold Breaker and Teravolt. Fur Coat is no more broken than Pure/Huge Power, and is arguably significantly less broken because good defensive Pokemon are much harder to make than good offensive ones.
Fur Coat Flareon would be good, but let's not pretend like it'd be unmanageable. It'd still be dead weight against a Rain team.