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Gamefreak isn't going to rewrite stats, but add a few moves, a reliable main STAB (priority or 100BP+ fire attack that isn't Fire Blitz which is just going to make him an inferior Darmanitan and make him kill himself faster) and maybe a better ability, and you can possibly fix Flareon. Kinda like this:
Flareon @ Toxic Orb / Choice Band / Life Orb
252 HP / 252 Atk+ / 4SpD
Guts / Technician?
[Insert 60BP Fire Priority here]
Earthquake
Superpower
Crunch / Outrage / Something
Put it under sun, now he can actually deal loads of damage. Also, The moves I listed make sense for a physical attacker like Flareon. If Chansey can learn Earthquake, Snorunt can learn Crunch, and Ampharos/Tropius can Learn Outrage, then someone who has fucking 130 base attack should be able of learning them. A better ability would also come in handy. Maybe TR support is necessary, but at least he would be much better than what he is now.
Glaceon and Leafeon arguably need boosts as well.