All-Purpose Wallbreakers: Terrakion - yes, Dragonite - yes, Salamence - yes ... Infernape - no (imo). I honestly don't see Infernape breaking up a stall team - it's gonna get 100% walled by Latias, which is a common Pokemon in stall, thanks to its unique special resistances. Infernape belongs in the circumstantial wallbreaker category, imo, where a stall team lacking Latias or Infernape used in a Sun team provides the condition for penetration :o
However, to add to the All-Purpose Wallbreakers, you could add
Hydreigon (LO mixed). With Outrage scoring 2HKOs on Chansey (SR & Spikes), Blissey (SR), and Gastrodon, EQ removing TTar and Heatran, and Draco Meteor / Fire Blast to slaughter everything else, people would be hard-pressed in stopping Hydreigon outside of revenge-killing. Also
Haxorus (SD) has the power to even break down Skarmory with a +2 Outrage. Combine it with Taunt, Draco Plate, Life Orb and/or Dragon Gem, and Haxorus rips through stall.
Specific Sets:
Hydreigon @ Life Orb
Trait: Levitate
EVs: 104 Atk / 240 SpA / 164 Spe
Hasty Nature (+Spe, -Def)
- Draco Meteor
- Outrage
- Fire Blast
- Earthquake
Enough speed to outrun neutral base 100 mons, enough attack to achieve the 2HKOs on special walls, and rest into SpA. It could go Mild Nature to even pack more punch.
Haxorus @ Draco Plate
Trait: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature (+Atk, -SpA)
- Swords Dance
- Outrage
- Earthquake
- Taunt
Dragon Dance (2x Dance), Dual Chop, and Brick Break are all alternative options over Taunt. Lum Berry, Life Orb, and even Dragon Gem are all viable items on this set.
I was very tempted to nominate
Latios as a Wallbreaker, but being Pursuit-weak and it's inability to 2HKO specially-defensive TTar really limits its capabilities. For this reason, it falls into the same category as Infernape as a circumstantial wallbreaker that can beat stall teams without TTar. It also struggles with Ferrothorn without HP Fire. SpecsLatios with Rain and Magnezone support is insane.
Latios @ Life Orb / Choice Specs
Trait: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature (+Spe, -Atk)
- Draco Meteor
- Psyshock
- Hidden Power [Fire] / Surf
- Calm Mind / Trick / Thunder(bolt)