Flareon isn't a very fortunate Pokemon in NU, and it's not difficult to see why. Firstly, Flareon is vulnerable to all forms of entry hazards, specifically Stealth Rock, which means it must think twice before switching. Its movepool is very scarce, so it's fairly easy to predict which set it is running. Finally, Flareon's Speed holds it back from performing a sweep. With all of this taken into account, there doesn't seem to be much of a reason to use Flareon.
Flareon's excellent base 110 Special Defense is that reason, and when paired with Wish, it gives Flareon the opportunity to function as both a special wall and supporter. Flareon's fantastic Attack stat catches the eye as well. Finally, Flareon has access to Flame Charge, which raises its Speed and also allows it to function as a wallbreaker or sweeper. Honestly, however, Flareon is a mediocre Pokemon, and it requires a bit of team support to be successful.
Despite its bad defensive typing, Flareon can still take advantage of its excellent Special Defense. This set supports Flareon's teammates as a Wish passer and acts as a special wall. In particular, it's a great check to Jynx, but be warned that Psyshock can cut through Flareon. Flareon can also wall Fire-types, namely Charizard, along with other special attackers, such as Kadabra, Choice Specs Ampharos, and Gardevoir.
Wish is the staple of the set, healing Flareon's teammates whenever it can. Wish works well with Protect, as it usually guarantees that Flareon will heal itself while scouting the opponent and racking up Leftovers recovery. However, Flareon isn't all about supporting its teammates, as its decent base 95 Special Attack can be useful as well. Lava Plume is the optimal choice, as it can compensate for Flareon's pitiful Defense with its 30% burn chance. However, if more power is desired, Flamethrower is an alternative. The final moveslot is based on preference. Heal Bell makes Flareon a true team supporter, removing status conditions from both itself and its teammates. Roar turns Flareon into a decent phazer, which comes in handy against setup Pokemon, such as Calm Mind Serperior and Musharna. Finally, Toxic can be used against opposing walls, such as Alomomola, and works well with Protect. However, Toxic is not recommended with Lava Plume, as Lava Plume's good burn chance can intervene with Toxic.Team Options & Additional Comments >>>
This set showcases Flareon's offensive potential. While its overall bulk isn't worth bragging about, Flareon's Special Defense is still useful, as it allows Flareon to absorb many special attacks. For example, Flareon is only 2HKOed by Choice Specs Gardevoir's Psychic. Flareon can reach up to 591 Attack with Guts activated, powering through the majority of the NU tier, including Kangaskhan, Eelektross, Armaldo, and Lickilicky. It works best as a mid-game or a late-game sweeper when the majority of the opposing team is weakened.
Facade is the key to this set; once Guts is activated, Facade is very powerful, nearly OHKOing Ursaring. Superpower is a great coverage move, and can OHKO a 252 HP/4 Def Lickilicky, as well as dent many Steel- and Rock-type Pokemon, specifically Probopass and Carracosta. Flame Charge is Flareon's STAB move; it increases Flareon's Speed with every hit, which can turn Flareon into a fast sweeper if used correctly. With Guts activated, Flame Charge can OHKO Eviolite Roselia and 3HKO Tangela at full HP. Bite is the move of choice in the final moveslot, as it allows Flareon to fare well against Ghost-types, namely Misdreavus and Golurk. However, Protect can be useful to ensure that Guts is safely activated.Team Options & Additional Comments >>>
Fire Fang is an option for a stronger physical STAB move. While Iron Tail offers great coverage, Superpower does a similar job and also has perfect accuracy. Will-O-Wisp can deal with physical attackers, but it rarely finds a spot on Flareon's moveset. Choice items can be used on Flareon, but due to its subpar bulk and lackluster Speed, it's generally outclassed by other Choice Fire-types, such as Rapidash. Life Orb can raise Flareon's power while keeping its versatility, but the recoil damage isn't desirable. Substitute and Yawn are also viable, as it can function as a bulky Substitute user that can force switches. RestTalk is also an option for Guts Flareon, but it's not that good. Curse is an option if you wish to improve Flareon's Attack and Defense, but it's also outclassed. Finally, Flareon can work on sun teams, playing best as a weather inducer, rather than as a sweeper.
Checks and Counters
Stealth Rock is a great way to weaken Flareon. Golem can not only set up Stealth Rock, but also annihilate Flareon with Stone Edge or Earthquake. Seismitoad is a great counter to Flareon as well, as it can handle both of its standard sets without difficulty. Piloswine also fares well against Flareon. Alomomola can 2HKO Flareon with Waterfall and is only 3HKOed by a Guts-boosted Facade. Swift Swim Ludicolo and Shell Smash Gorebyss can cleanly OHKO Guts Flareon with their Water-type attacks.
There are many Pokemon that can easily defeat Flareon but dislike the chance of being burned. For example, Golurk is a great counter to the Wish set, as it takes little from Flareon's Lava Plume and OHKOes it in return with Earthquake. However, if its burned, Golurk will be rendered useless. Physical attackers and Choice Band users, such as Samurott, Life Orb Braviary, Floatzel, Choice Band Sawk, and Kangaskhan, can easily handle Flareon because of its low Defense stat. However, they must also be wary of a burn from Lava Plume. Gurdurr, on the other hand, can wall Flareon's attacks and can even take advantage of any status Flareon inflicts on it.
Flareon is pretty slow even with maximum Speed investment, so many Choice Scarf users can outspeed and KO it. Tauros can outspeed and KO +1 max Speed neutral-natured Flareon even without a Choice Scarf. On its own, Flareon is not that difficult to defeat, as many teams carry at least one of Flareon's counters.