TankChomp epicness! :D
Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 232 HP / 24 Atk / 252 Def
24 Atk Garchomp Stone Edge vs. 0 HP / 4 Def Talonflame: 484-572 (162.9 - 192.5%) -- guaranteed OHKO
252+ Atk Choice Band Talonflame Brave Bird vs. 232 HP / 252+ Def Garchomp: 175-207 (42.1 - 49.8%) -- guaranteed 3HKO
+2 252 Atk Sharp Beak Talonflame Brave Bird vs. 232 HP / 252+ Def Garchomp: 255-301 (61.4 - 72.5%) -- guaranteed 2HKO
This Garchomp can tank Brave Birds like a boss while setting up. No one in their right mind keeps Talonflame in on non-scarf Garchomp (and even then Garchomp has to be scarfed into Earthquake) and so it can set up easily and punch holes in the opposing team.
Oh, and keep in mind that these calcs are for base form Garchomp. Mega Garchomp tanks even better.