At level 100, with an Impish nature and fully super trained in ATK and DEF, Mega Mawile has stats of

ATK 309
DEF 364
SP ATK 131
SP DEF 214
SPD 118

With a moveset Play Rough, Iron Head, Crunch, and Stone Edge, Diantha doesn't stand a chance

/vp/, why aren't you paying homage to best physical sweeper this gen?