... But Flareon sucks because it's movepool sucks. So giving it a better movepool, a great STAB, or a better ability WOULD actually make it better. See how that works?
No, it sucks because it has absolutely the worst possible distribution of stats in combination with its type. If it got Flare Blitz, it'd 2HKO itself from the recoil. If it got Rock Head as an ability (which there's absolutely
zero chance of happening, btw), along with Flare Blitz, it would be outsped and KO'd by pretty much everything important. Sure, it might KO Bronzong or something, but literally
anything that would be classed as a sweeper outspeeds and KOs, since it has terrible defenses (I know it has 110 SpD, but that's made up for by its crap HP). Not to mention that it's losing 25% of its HP every time it switches in (assuming SR is as prevalent in BW as it is now).
EDIT: @above: Flareon already has Fire Fang. It's shit. And why BP to it when there are far superior sweepers that don't require it,
and far better BP recipients, such as Octillery, Marowak, Rampardos, etc.
Also, kinda ninja'd by Blasphemy :/