You can use Talonflame as an AcroGem set if it's going to fill the role of a mid-game sweeper, but I find that with its frailty and very subpar attack stat, it does best as an end-game clean-up once its counters have been taken out by the likes of Terrakion or other Fighting-types that can deal with Rock (its hardest counter) properly. Even with LO and assuming against full-HP OHKOs (worst case scenario) with 80 HP EVs, it can fire off at least 3 Flare Blitzes/Brave Birds before going down, more often than not taking down at least two, if not completely finishing off the whole team. I can see an AcroGem set working if you run Swords Dance and force something out, but its still largely outclassed by the likes of Hawlucha or Lucario.