not very sure if guts abuse deserves its own set, or only warrants an AC / extended OO mention. flareon's movepool really really sucks and that set can't even pretend to hide it lol, but it's nearly just good enough to do what it needs to, and this is the only tier flareon can even dream of running something like it X:
<3> you gamefreak
[Overview]
[SET]
name: Wish
move 1: Wish
move 2: Protect
move 3: Flamethrower / Lava Plume
move 4: Toxic / Roar
item: Leftovers
ability: Flash Fire
nature: Calm
evs: 252 HP / 4 Def / 252 SpD
[SET COMMENTS]
[ADDITIONAL COMMENTS]
[Other Options]
[Checks and Counters]
[SET]
name: Guts
move 1: Fire Fang / Flame Charge
move 2: Facade
move 3: Protect..?
move 4: Quick Attack
item: Toxic Orb
ability: Guts
nature: Adamant
evs: 252 Atk / 4 Def / 252 Spe
[SET COMMENTS]
[ADDITIONAL COMMENTS]

<3> you gamefreak
[Overview]
- red-headed stepchild etc etc
[SET]
name: Wish
move 1: Wish
move 2: Protect
move 3: Flamethrower / Lava Plume
move 4: Toxic / Roar
item: Leftovers
ability: Flash Fire
nature: Calm
evs: 252 HP / 4 Def / 252 SpD
[SET COMMENTS]
- surprisingly decent special wall
- wish+protect for toxic stalling
- toxic lets you come up on top vs bulky waters and special walls
- roar for subcm users
- wish provides team healing too if you're really really desperate
- lava plume burn can be handy, but can also burn someone you'd rather toxic eg. most bulky waters
[ADDITIONAL COMMENTS]
- max spdef to sponge scalds
- roar / heal bell
- guts is useless on a defensive / specially attacking set
- physical attackers, especially water, rock, ground types
- pair with physical wall, eg eviolite tangela, quagsire, alomomola
- toxic spikes support eg roselia, scolipede
- rapid spin support - wartortle appreciates Wish
[Other Options]
- curse / work up / flame charge boosting sets
- baton pass curse / work up / substitute but see: combusken
- guts abuse but most of his good physical moves (iron tail, superpower) are illegal with guts
- choice band
- choice scarf set can make use of dry pass, but otherwise outclassed by emboar - flash fire much less useful in NU than in RU
- choice specs but his special movepool consists of fire blast / overheat / flamethrower / lava plume / shadow ball / hidden power
- may be useful to provide a list of its moves so you can
despairget creative: fire fang, flame charge, bite, return, facade, flail, last resort, natural gift, iron tail, bite, dig, rock smash - yawn, will-o-wisp, toxic, confuse ray, charm, tickle, fake tears
[Checks and Counters]
- (very) bulky waters eg Alomomola, Wartortle, Quagsire
- rock-types eg Rhydon, Golem, defensive Armaldo
- offensive sets can be revenge killed easily
name: Guts
move 1: Fire Fang / Flame Charge
move 2: Facade
move 3: Protect..?
move 4: Quick Attack
item: Toxic Orb
ability: Guts
nature: Adamant
evs: 252 Atk / 4 Def / 252 Spe
[SET COMMENTS]
- entei-lite?
- packs the power of choice band with the ability to switch moves - difficult to wall
- guts-boosted facade its strongest physical move, 2KOes bulky waters
flare blitz flare blitz flare blitzfire fang its strongest physical STAB, hits bulky grasses- flame charge boosts its meh speed
- priority in quick attack useful as always, picks off weakened pokemon, says hi to kadabra, damages revenge killers
- Protect to safely activate Guts
[ADDITIONAL COMMENTS]
- max atk, max spe
- outspeeds uninvested base 95s like Leafeon, and other stuff like uninvested Klinklang and Mesprit
- rock smash to 2ko Bastiodon, bite for... i'm not too sure what. a neutral facade hits harder than a supereffective bite
- Superpower and Iron Tail are illegal with Guts - possible Flash Fire CB set
- thunder wave support esp if not running flame charge eg. mesprit
- entry hazard support, torterra shares good synergy, roselia/ scolipede are good spikers
- rapid spin support eg wartortle
- faster clean-uppers who appreciate bulky waters and walls removed eg DD Altaria, RP Rhydon, Floatzel