In regards to Pyroar being possibly "game-changing," as suggested earlier, let's take under consideration Elbow's list (thank you) of 14 competitive decks (and I'll add 2 more) vs. Pyroar-included decks (yet to be determined) and examine how much (high level) of an impact Pyroar might have in those particular match-ups. Following are some of my thoughts:
- Aromatisse variants. Assuming Aromatisse is the only stage 1/2 Poké in the deck, these players need only to add Hard Charm to prevent a KO. On the other hand, Aromatisse can attack and KO a Pyroar with laserBank. And since Aromatisse decks have some type of healing, Aromatisse can be healed and return to the bench. Also, Aromatisse decks will have energy attachment acceleration and manipulation; so, advantage (albeit small): Aromatisse.
- Blastoise. Pyroar is easily 1HKOd by Blastoise, having NO impact on this deck at all. Advantage: Blastoise.
- Darkrai variants (without evolutions). Currently, these decks (assuming only basic Poké are in the deck) will be impacted by Pyroar somewhat... IF the Lilteo can survive the expected Night Spear attacks and evolve to Pyroar. Also, the Darkrai deck players (at least the ones I've seen) play Catcher and LaserBank. And Darkrai deck players have energy attachment acceleration too. So, advantage (small): Darkrai variants (without evolutions).
- Darkrai variants (with evolutions e.g., Hydreigon or Garbodor). Pyroar is easily 1HKOd, having NO impact on this deck at all. Advantage: Darkrai variants (with evolutions).
- Empoleon. Pyroar is easily 1HKOd, having NO impact on this deck at all. Advantage: Empoleon.
- Gourgeist-Dusknoir (1 of the 2 decks I'm using to augment Elbow's list). With damage counter "drops" and "movement", Pyroar will not impact this deck either. Advantage: Gourgeist-Dusknoir.
- Ho-Oh. I have yet to see a deck built around this Poké (probably due to a significant number of Blastoise decks being played in my area); although I have seen it as a tech in a few decks at some tournaments. I'll just concede the matchup advantage to decks running Pyroar.
- Kingdra-Greninja. This is another fun deck to play since you have a great combo of Water Shuriken(s) followed by either Kingdra's Tri-Bullet or Dragon Vortex. Pyroar is easily 1HKOd, having NO impact on this deck at all. Advantage: Kingdra-Greninja.
- Ninetails. Expect Lilteo and/or Pyroar to just be Bright Look'd and 1HKOd having NO impact on this deck at all. Advantage: Ninetails.
- PlasmaBox (2nd of the 2 decks I'm using to augment Elbow's list). There are several variations of this deck. These decks (assuming only basic Poké are in the deck) will be impacted by Pyroar somewhat... IF the Lilteo can survive the expected Frost Spear attacks and evolve to Pyroar. Also, some of these deck players (at least the ones I've seen) play Genesect (for Red Signal) or Catcher. And PlasmaBox deck players have energy attachment acceleration too. So, advantage: PlasmaBox.
- Raichu-Dugtrio-Eeveelutions. All evolutions.... Pyroar can be easily 1HKOd, having NO impact on this deck at all. Advantage: Raichu-Dugtrio-Eeveelutions.
- RayBoar (or RayBoarPhox). In either case, Pyroar can be easily 1HKOd by the supporting stage 2 Poké in these decks rendering Pyroar's impact to little, if any at all. Advantage: RayBoar/Phox.
- Trevenant-Accelgor. Mostly evolutions comprise this deck and this deck can also apply certain "locks"; so, I expect Pyroar to have no impact on this deck either. Advantage: Trev-Gor.
- Tool Drop. I have yet to see this deck played at any major tournament (e.g., States) and although this deck is supported by a stage 1 Poké, it (i.e., Masquerain) may not prove strong enough to counter Pyroar. I'll just concede the matchup advantage to decks running Pyroar.
- VirGen without Balloons. I expect VG deck players to just Red Signal the Lilteos and then just 1HKO them. With energy attachment acceleration, "Catcher" ability, and immunization to Status Conditions, I don't see Pyroar's impact being significant on this deck either. Advantage: VirGen without Balloons.
- VirGen with Balloons. All the above comments; plus now, you have an evolution that can also 1HKO Pyroar with Laser Bank). Again, I don't see Pyroar impact this deck either. Advantage: VirGen with Balloons.
- Yeti. I've only seen 1 player play a version of this deck in my area and the variant deck I've seen run contained primarily Team Plasma Poké, all of which were basic; so, Pyroar may impact this deck somewhat. However, if the Yeti deck player plays Genesect EX, he/she can just Catcher and KO the Lilteos or other opponent's Poké, essentially "play around" Pyroar. Advantage: Yeti.
- Weavile. This is another deck based upon a Poké evolution, and this deck also has energy acceleration attachment too. Pyroar is easily countered, having NO impact on this deck at all. Advantage: Weavile.
Overwhelmingly, most competitive decks (especially in the hands of skilled players), I believe, will not be greatly affected by an opponent's Pyroar. Pyroar as a "game-changing" Poké... I still don't believe so, but I welcome others' thoughts.