>>724136929
Assuming normal Mawile
>252+ Atk Mawile Play Rough vs. 0 HP / 4 Def Blaziken: 162-192 (53.8 - 63.7%) -- guaranteed 2HKO

But Mega Mawile
>252+ Atk Huge Power Mawile Play Rough vs. 0 HP / 4 Def Blaziken: 322-381 (106.9 - 126.5%) -- guaranteed OHKO

Then again we're comparing a Mon with base 50 speed VS one with 80 base speed and the hidden ability Speed boost

So
>252+ Atk Huge Power Mawile Sucker Punch vs. 0 HP / 4 Def Blaziken: 84-99 (27.9 - 32.8%) -- guaranteed 4HKO

Meanwhile on the chicken side
> 252+ Atk Life Orb Blaziken Close Combat vs. 52 HP / 0 Def Mawile: 304-359 (119.6 - 141.3%) -- guaranteed OHKO

Even without life orb
>252+ Atk Blaziken Flare Blitz vs. 52 HP / 0 Def Mawile: 468-552 (184.2 - 217.3%) -- guaranteed OHKO