Infernape @ Life Orb
Ability: Iron Fist
EVs: 168 Atk / 88 SpA / 252 Spe
Naive Nature
- Fire Blast/Flare Blitz
- Close Combat
- Mach Punch
- Hidden Power Ice/Grass Knot/Thunder Punch
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
(OPTIONAL)
Altaria @ Altarianite
Ability: Natural Cure
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Dragon Dance
- Return
- Earthquake
- Roost
I think that this core works well because infernape is able to destroy steel types such as ferrothorn skarmory and chansey, while rotom-w can provide a safe switch in thanks to volt switch.It can also beat talonflame and some water types like azumarill,
I'm not really sure about the mega but I thought of mega altaria because it can be a solid answer against the latwins and other dragon types that infernape doesn't really appreciate(such as garchomp).In return, infernape can break trough steel and ice types, allowing mega altaria to sweep.
NOTE:If you think that the infernape stallbreaker set is more viable that's fine aswell