Flareon

Flareon experiences a stark shift from its original role in cartridge RBY, now functioning as a Focus Energy user in Stadium OU. Once boosted, Flareon becomes extremely threatening, with even Fire-resistant Pokemon like Slowbro and Starmie taking over 40% if Fire Blast lands a critical hit thereafter. It's not just a strong special attacker either; Flareon has a solid base 130 Attack stat to support it against Pokemon like Chansey, which it can 2HKO with consecutive critical hit Body Slams. If an opposing team has been paralyzed, Flareon can savagely rip into it with some of the strongest mixed offense available.

However, that's about all Flareon can offer: its firepower is no joke, but it's terrible on the defensive, taking serious damage from any attack, having zero defensive utility in its typing, and lacking reliable recovery. Its Speed also leaves a bit to be desired, with it being narrowly outrun by Cloyster, often meaning it requires paralysis support to be effective; this also makes it terrified of receiving paralysis itself. Because it demands paralysis support and offers little defensive utility, Flareon is difficult to build around. Additionally, it has no consistent methods of handling Water-types like Starmie and Slowbro, forcing it out and giving these two powerhouses significant momentum. Furthermore, Flareon is extremely inconsistent, relying on consecutive critical hits to KO Pokemon, which tend to only happen around a third of the time at best even after Focus Energy. Ergo, Flareon is a rare sight in the metagame.