I posted this in the Creative Set thread, but I figured I'd post it here as well.
Talonflame @ Salac Berry
Gale Wings
Adamant 252 Atk / 4 Def / 252 Spe
-Acrobatics / Brave Bird
-Flare Blitz
-Natural Gift
-Swords Dance / U-Turn / Roost / Tailwind / Will-O-Wisp / Thief
I designed this set to take down or do severe damage to most of Talonflame's usual checks and counters. Salac Berry Natural Gift hit both standard Heatran and Tyranitar hard.
252+ Atk Salac Berry Talonflame Natural Gift (100 BP Fighting) vs. 252 HP / 0 Def Tyranitar: 324-384 (80.1 - 95%) -- guaranteed 2HKO
+2 252+ Atk Salac Berry Talonflame Natural Gift (100 BP Fighting) vs. 252 HP / 0 Def Tyranitar: 644-760 (159.4 - 188.1%) -- guaranteed OHKO
252+ Atk Salac Berry Talonflame Natural Gift (100 BP Fighting) vs. 252 HP / 0 Def Heatran: 168-198 (43.5 - 51.2%) -- guaranteed 3HKO after Leftovers recovery
+2 252+ Atk Salac Berry Talonflame Natural Gift (100 BP Fighting) vs. 252 HP / 0 Def Heatran: 332-392 (86 - 101.5%) -- 12.5% chance to OHKO
If Tyranitar switches in to tank the Brave Bird, Acrobatics, or Flare Blitz, Salac Berry Natural Gift has a high chance of finishing it off. In fact, if Tyranitar has taken any prior damage, Natural Gift will surely KO as it even has 50% chance to OHKO after Stealth Rock. Heatran on the other hand will take roughly 50% from the blow, which is a good chunk considering it relies on Lefties for recovery, not to mention the standard Specially Defensive Heatran doesn't usually carry a way to heavily damage Talonflame in return.
4 SpA Heatran Lava Plume vs. 0 HP / 0 SpD Talonflame: 73-87 (24.5 - 29.2%) -- 99.9% chance to 4HKO
The last slot is really whatever you need it to be, but U-turn and Swords Dance are the best options in my opinion. U-turn is good since this set doesn't have a way to deal with Talonflame's other biggest counter, Rotom-W and gives you the opportunity to damage it while switching out to something that can deal with it simultaneously. Roost can be used if you feel like you need recovery for whatever reason (like healing off Stealth Rock damage) while Tailwind and Will-O-Wisp can be used to support the team. I added on Thief as the last slash since I feel like it'd be an interesting option similar to Knock Off and Trick. Many Pokemon (if not all) like having their items intact, like Choice Band, Leftovers, Life Orb, Sitrus Berry, and Lum Berry. Being able to steal those items away and use them yourself is pretty powerful, imo (if running Thief, I'd suggest Brave Bird over Acrobatics).
Of course the EVs aren't perfect. You could easily run a 194 HP / 252 Atk / 4 Def / 60 Spe spread like the standard Swords Dance set if you want.