Fyi, Flareon has a base 110 sp. defense. A 95 base special attack isn't anything to laugh at, so taking that into consideration, a Flareon with, say, a mild nature could be a freaking beast. :| Defense would be crappy, but every pokemon has a weakness that's pretty much inevitable.
Clearly you haven't done your homework.
And isn't Scizor one of the top used OU pokemon? :|
And yet again you state bad examples by throwing water types out there. I'm pretty sure a Mild Flareon with HP Grass could take out a Swampert, granted that it uses Surf instead of Earthquake, which Flareon would most likely survive anyway because of it's monstrosity of a special defense.
Note that it is the only Fire type pokemon with the Highest special defense. You rarely see defensive fire types(except heatran) in this point and time.