Pyroar is a very scary threat in the current meta and functions optimally if you're able to remove bulky Rock-types like Regirock, Carbink, and Cradily, specially defensive walls and tanks like standard CM Clefairy, Type: Null, Audino, AV Lanturn, and AV Hitmonchan, and other Fire resists like Poliwrath, Munchlax, and Drampa, so I built with beating these Pokemon in mind. I also gave special consideration to answering some of its other offensive checks, namely Choice Scarf Primeape, Alolan Dugtrio, Gurdurr, and so on.
I first chose AV Lanturn as an offensive partner to Pyroar; not only does it gain momentum for Pyroar via its slow Volt Switch, but it can also weaken or remove opposing Lanturn, Regirock, and Carbink via a combination of Whirlpool and Weezing's Toxic Spikes, which in turn opens up the way for Pyroar to deal maximum damage. Using Whirlpool is possible on this set because HP Grass is no longer a critical component to AV Lanturn's kit as a result of Gastrodon leaving the tier soon (even if you do match up with Gastrodon before it leaves, CB Hitmonchan can 2HKO that with Close Combat if it switches in directly). Lanturn's EV spread is a little different than what you're used to seeing probably, but it is mainly used for creeping other AV Lanturn and Jolly Aggron (Jolly Aggron is nice in the current meta, seeing as how it creeps both standard AV Lanturn and Aurorus by a couple of points at 218 Speed total). Lanturn creeping and KOing Modest Aurorus is helpful for Wormadam-Trash too, so that it isn't overwhelmed in checking both Ice- and Psychic-types by itself. Lanturn was so close to outspeeding neutral-natured base 60s like Abomasnow (even if Abomasnow runs a +Speed nature more often than not) and Pawniard at 219 Speed total, so I dumped another point in for those because the loss in Special Defense was negligible. Lanturn basically cushions blows from various special attackers for the team and answers stuff like opposing Pyroar and Oricorio-Sensu for Wormadam-Trash and Weezing, Swanna for Hitmonchan, and Manectric for Swanna. It can even trap stuff like Weezing for Hitmonchan, which happens in the replay below. After the team was complete, I noticed I was a little weak to Oricorio-PomPom, Silvally-Dragon, and Alolan Exeggutor, so I added Ice Beam to round out Lanturn's set. I also slashed Discharge over Whirlpool; while Whirlpool is great for trapping what Pyroar needs gone, Discharge can save you if you're forced to stay in on bulky Oricorio-Sensu in case you weren't able to take it out with Hitmonchan's CB Ice Punch on the switch. Shoutouts to
jklioe for that tech.
Next, I added
CB Jolly Hitmonchan. Not only does it explode most of Pyroar's stops (listed above) with a CB-boosted Close Combat, but it can potentially lure specially defensive Clefairy for Pyroar by 2HKOing it with Earthquake, too:
252 Atk Choice Band Hitmonchan Earthquake vs. 252 HP / 4 Def Eviolite Clefairy: 167-197 (48.5 - 57.2%) -- 94.1% chance to 2HKO.
Hitmonchan also brings in checks to Fighting-types like Weezing, Gourgeist-XL, Tangela, Shiinotic, Silvally-Fairy, Sableye, etc., most of which are destroyed by Firium Z Pyroar. If your opponent has a bulky Oricorio-Sensu or -PomPom as their Hitmonchan switch-in in the back, simply click Ice Punch; CB Jolly Ice Punch OHKOes them both after Stealth Rock damage is factored in, which in turn takes some of the pressure off of AV Lanturn so that it can focus on removing stops to Pyroar via Whirlpool:
252 Atk Choice Band Iron Fist Hitmonchan Ice Punch vs. 248 HP / 172 Def Oricorio-Sensu: 272-322 (77 - 91.2%) -- guaranteed OHKO after Stealth Rock.
Additionally, removing both Oricorio forms this way allows Weezing to function without having to preemptively use Taunt on the switch to stop them from setting up with Calm Mind. Hitmonchan has a 93.8% chance to OHKO Lycanroc with Mach Punch from full, which is important to know, considering it's one of the team's few checks to it here (the other being Choice Scarf Swanna, which can easily be pressured by SR and beaten by Accelerock if your opponent knows the set or if Swanna is low on HP).
With opposing Lanturn and Rock-types being checked by CB Hitmonchan, trapped by my own AV Lanturn, and worn down by Weezing's Toxic Spikes, this opened up the way for
Choice Scarf Swanna to easily clean late-game with Brave Bird or Hurricane. It also shares fantastic synergy with Lanturn, given that it brings in Electric-type moves for Lanturn to take advantage of via Volt Absorb, forming gen 7's version of the classic SwanChou core. Swanna acts as your check to +1 Lilligant and +1 Jynx here and as a secondary check to AV Hitmonchan for Pyroar, just in case Weezing's been knocked out early-game. While this used to be its specially oriented set, I realized physically oriented Choice Scarf Swanna lures in specially defensive Clefairy with invested Brave Bird, the same way CB Hitmonchan does with Earthquake:
252 Atk Swanna Brave Bird vs. 252 HP / 4 Def Eviolite Clefairy: 178-210 (51.7 - 61%) -- guaranteed 2HKO.
Be aware though, compressing entry hazard removal onto your Choice Scarf user pretty much means you have to play aggressively early-game, otherwise you have to be comfortable sacrificing Swanna when it's time to Defog mid-game. Basically, decide if removing entry hazards or if cleaning with Swanna is more important, then play accordingly. Alternatively, Rapid Spin can fit on Hitmonchan's set, especially if you opt for Life Orb over Choice Band. You basically lose a lure to specially defensive Clefairy by doing this, but on the flipside, this allows Swanna to focus on cleaning late-game rather than worrying about removing entry hazards.
Even though Swanna works well in eliminating the Fighting-types that give Pyroar trouble, i.e. Primeape, Gurdurr, Hitmonchan, Combusken, and Poliwrath, it's easy enough to pressure Swanna to the point another check to these is necessary to not be overwhelmed when Stealth Rock is cutting into Swanna's HP. That's where Weezing comes in; not only does it counter Primeape, Gurdurr, and Hitmonchan for Pyroar, but its Toxic Spikes in combination with Lanturn's Whirlpool are great for wearing down specially defensive tanks and walls for it, too. Additionally, the HP lost cannot be recovered thanks to Weezing's Taunt, leaving Pokemon like Type: Null unable to switch into Pyroar later on. Not allowing Regirock and Clefairy to set up Stealth Rock really helps out Pyroar and Swanna here, so Taunt is really a non-negotiable slot here, imo.
Using Flamethrower over Sludge Bomb was an afterthought, but doing so greatly improved this team's matchup against Hail squads, with Flamethrower disallowing Alolan Sandslash to setup behind a Substitute. Flamethrower also lets Weezing destroy Togedemaru so that Swanna can freely lock into Brave Bird. Similarly, Weezing beats Ferroseed for Wormadam-Trash and Lanturn, and hard-counters Alolan Dugtrio. Alolan Dugtrio in particular would be very threatening to the team otherwise, given it outspeeds and OHKOes Lanturn and non-choiced Pyroar, places heavy pressure on Wormadam-Trash, and can threaten Hitmonchan from behind a Substitute.
By this point in the building process, I was missing a check to Psychic-types for Weezing and Hitmonchan, and even though AV Lanturn and Hitmonchan can check Aurorus, I didn't really have a surefire switch-in for it (lol what's that). At the same time, I realized I still hadn't added a SR user, so Wormadam-Trash was an easy addition for its role compression. Along with Stealth Rock, it adds a decent Normal resist to the team; it avoids the 2HKO from CB Stoutland's Return. It also acts as a hard-counter to some of the tier's best Ice- and Psychic-types: for example, it avoids the 4HKO from Aurorus's Specs Blizzards and the 3HKO from Jynx's +2 Ice Beam while OHKOing both in return without any prior damage. These damage calculations in conjunction with Overcoat allowing it to avoid being buffeted by Aurorus's Hail make it one of the best counters to Ice-types in the tier:
+2 252 SpA Jynx Ice Beam vs. 248 HP / 144+ SpD Wormadam-Trash: 110-130 (34 - 40.2%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery
116 Atk Wormadam-Trash Iron Head vs. 0 HP / 4 Def Jynx: 326-386 (120.2 - 142.4%) -- guaranteed OHKO
252+ SpA Choice Specs Aurorus Blizzard vs. 248 HP / 144+ SpD Wormadam-Trash: 100-118 (30.9 - 36.5%) -- guaranteed 4HKO after Leftovers recovery
116 Atk Wormadam-Trash Iron Head vs. 0 HP / 4 Def Aurorus: 388-460 (100.2 - 118.8%) -- guaranteed OHKO
ShuckleDeath put me onto this EV spread, but if you run some Attack investment, you can OHKO Aurorus and Jynx, as well as 2HKO specially defensive Clefairy when running Iron Head. Having so much counterplay to Clefairy really lets Pyroar shine, so Wormadam-Trash was a worthy addition even if it looks weird on paper sometimes.
116 Atk Wormadam-Trash Iron Head vs. 252 HP / 4 Def Eviolite Clefairy: 176-210 (51.1 - 61%) -- guaranteed 2HKO
I've got a second configuration for you with Scarf Togedemaru, Silvally-Water, and bulky Oricorio-Sensu, but it's still in testing. Send me a PM if you'd like to play with that version, too. Anyway, I hope you enjoy the team!