Stakataka @ Leftovers 
Ability: Beast Boost 
EVs: 252 HP / 4 Atk / 252 SpD 
Sassy Nature 
IVs: 0 Spe 
- Gyro Ball 
- Rock Blast 
- Stealth Rock 
- Toxic / Protect
Pidgeot-Mega @ Pidgeotite 
Ability: No Guard 
EVs: 252 SpA / 4 SpD / 252 Spe 
Timid Nature 
IVs: 0 Atk 
- Hurricane 
- Refresh 
- Work Up 
- Roost
I wouldn’t really recommend this Pidgeot set though, as very few (none) competent stalls have been swept by this without an absurd amount of support / luck due to almost all of them having one of Aero / Aggron / Nihilego / Staka and probably some other stuff I’m missing aswell. A better means of using Pidgeot as a tool against stall would be to use the below set alongside a threatening fighting type breaker such as Terrakion or Infernape.
Pidgeot-Mega @ Pidgeotite 
Ability: No Guard 
EVs: 252 SpA / 4 SpD / 252 Spe 
Timid Nature 
- Hurricane 
- Heat Wave 
- U-turn
- Roost
You can opt for Hidden Power Ground or other fancy stuff in the last slot if you want.