Megas Best to Worst

Mega Latios
Mega Mawile
Mega Lopunny
Mega Diancie
Mega Kangaskhan
Mega Alakazam
Mega Charizard X
Mega Gallade
Mega Scizor
Mega Altaria
Mega Gyarados
Mega Sharpedo (With Speed Boost)
Mega Venusaur
Mega Pinsir
Mega Medicham
Mega Gardevoir
Mega Swampert
Mega Charizard Y
Mega Aggron
Mega Tyranitar
Mega Manectric
Mega Beedrill
Mega Pidgeot
Mega Sceptile
Mega Steelix
Mega Aerodactyl
Mega Garchomp
Mega Slowbro (No Forced Mega)
Mega Sableye
Mega Absol
Mega Sharpedo (No Speed Boost)
Mega Houndoom
Mega Blastoise
Mega Heracross
Mega Ampharos
Mega Slowbro (Forced Mega)
Mega Glalie
Mega Audino
Mega Camerupt
Mega Abomosnow
Mega Banette