Back in the early days of double bird, Talonflame was pretty often used as the utility oriented fowl, considering how easily Staraptor was worn down, and that people often needed a Ground immunity/u turn resist far earlier in the match than Raptor/Pinsir or Dragonite could afford to provide. For us hipsters, I'm sure we can agree that it was pretty fun to shut down Chansey's wish passing to her flying resisting partners.
Piggy backing on the Bulk Up topic, could we talk about how exquisite a partner Magnezone is to this set? Not only do you avoid grinding Talonflame to a pulp against defensive threats like Rocky Helmet Ferrothorn or Skarmory, you can proceed to pressure Offensive threats to a degree, given some momentum.
Tbh, Bulk Up Talonflame uses Ferro as set up bait - Once it gets to +6 not much is going to stop it, let's not forget the fact that you're at +6 Defence running a specially orientated defensive set, you can easily gain a Roost to off-set the recoil. Skarmory is honestly in the same boat as Ferrothorn, it's set up for Talonflame, they both get hit by Taunt and can do nothing in return - the only redeeming factor in Skarmory's case is Counter.
Magnezone sounds like a great partner in theory but the major threats to this set are Tyranitar and Rotom-W, let me go into that further. Running a Talonflame without U-Turn is a huge burden as it can lose you a tonne of momentum if either of these two switch in. In fact, the set struggles with sand offence in general, Smooth Rock Tyranitar doesn't care about Talonflame's Brave Bird's and even Sand Rush Excadrill gains free switch ins - Magnezone isn't doing much to help you there, it's probably making Sand Offence and even bigger issue for you to face.
One of the best partners you can give Talonflame is a decent Fighting type.
Keldeo - is a nuke in the current meta, it's also a great BU Talonflame partner, switching into Tyranitar and creating a headache for the opposing team.
Breloom - These two were made for each others, Breloom handles all three Tyranitar, Excadrill & Rotom-W a very handy partner imo.
Conkeldurr - Another excellent partner, gaining a possible guts boosted burn from Rotom-W, not much will like to switch in.