Mega Mawile Solo vs Power Up Punch

Not too bad a solo, 33 seconds left. Think PuP might be the easiest move tho. Its very wet, cold and windy here so that evens things out!
Team
Primal Groudon MS/PB L50
Landorus MS/SS L50
Shadow Garchomp MS/EP L45?
Necrozma MC/SS L50
Shadow Charizard x2 FS/BB L50
Rainy weather and, being a Solo, no PP.