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Gen 1: It's slow and physically frail. Also has barely any movepool. Its amazing 130 Atk can't be used effectively because Fire is a Special. However at least its SpAtk is a respectable 110.
Gen II: The only Eeveelution to lose 15 from its SpAtk so its STAB moves are come from a lackluster 95 SpAtk.
Gen III: New EV system and Natures killed Mixed Attackers for anyone without Pseudo level Base Stats, so Flareon has to choose between running STAB at only 95 SpAtk, or 130 Atk without STAB.
Gen IV: Phys/Spec Split SHOULD have been Flareon's Woodstock but the only Physical Fire move they gave it was Fucking 65BP 95 Acc Fire Fang even though Flare Blitz literally sounds like Flareon's Signature move. Also Stealth Rock.
Gen V: Things start to look up. Gets Guts to boost Atk and Flame Charge to boost Speed. Though everything else got stronger.
Gen VI: Finally gets Flare Blitz. However, this just reveals how retarded Flareon’s stat spread is. Its HP is too low to use recoil moves effectively. It’s also slow so it will almost always take extra damage before getting to attack.
Gen VII: UNTEIRED the highest dishonor a fully evolved Pokemon can ever suffer. Not only that but Eevee got a move calls Sizzly Slide that’s 90BP and always burns, and it’s flat-out based on Flareon. In a fair world this would become Flareon’s signature move. However, only the partner Eevee that can’t evolve gets it so Flareon loses once again.
Gen VIII: Survive Dexit by virtue of being an Eeveelution, but even with the limited dex it’s even more useless due to power creep. It gets two new fire moves (Burning Jealously and Mystical Fire) and Scorching Sands for ground coverage but they all of those are Special, making them worthless to Flareon. Even more insultingly, burn damage got nerfed which is a huge boon for every Guts user except Flareon because as a Fire type it cannot be burned.