I've found a bit of success using a support Talonflame set.
Talonflame @ Leftovers
Ability: Gale Wings
EVs: 96 HP / 252 Atk / 32 Def / 128 Spd
Jolly Nature
- Brave Bird
- U-turn
- Will-O-Wisp
- Tailwind
128+ Spe investment puts it at 352 Speed; enough to outpace 252+ base 110's. 252 Atk allows it to still deal with a number of dangerous offensive Pokémon with Brave Bird if you can predict the switch-in, such as Terrakion, Latios, Gengar, Espeon, Gyarados without Intimidate, MoxieMence, and (sometimes) MegaXard. It also retains enough power to beat its usual prey with Brave Bird.
96 HP EVs put it at 321 HP; an odd number so it can switch into SR three times, and it's just above a multiple of 16 for more efficient Leftovers recovery. If you want to use Life Orb over Leftovers for more oomph at the cost of HP, run 88 HP EVs instead so you take less LO recoil.
The rest of the EVs are put into Defense so it can take priority attacks a fraction better, particularly Azumarill's Aqua Jet, which fails to OHKO unless it's holding a Choice Band (and Talonflame actually stands a chance to win 1-on-1 if the Aqua Jet isn't item-boosted).
Will-O-Wisp + U-turn really shines on this set. Any competent player is going to switch in a counter the moment they see Talonflame, but this set can cripple the counter (most commonly Rotom-W and Tyranitar, I've noticed) with Will-O-Wisp, then safely U-turn out unless the counter is a Scarfer. 232/0 Rotom-W takes a minimum of 47% from U-turn and the two turns of burn damage it takes in forcing Talonflame out, and 252/0 Tyranitar takes a minimum of 51%.
If you're looking to go on the offense, you can use priority Tailwind before U-turning out to a bulky wallbreaker, such as a Mega. After Tailwind, only Scarf Deoxys-S and priority outspeed Talonflame, and the only priority attack that can OHKO Talonflame is CB Azumarill's Aqua Jet, so U-turning away is very easy.
You need good prediction to use this Talonflame set to its full potential, but it's a nightmare in the right hands and with the right partners.