http://pokepast.es/a72846bba848e8a4
with BB+sg
+1 252+ Atk Magearna All-Out Pummeling (140 BP) vs. 248 HP / 252+ Def Eviolite Chansey: 534-630 (75.9 - 89.6%) -- 18.8% chance to OHKO after Stealth Rock
with FB
252+ SpA Magearna All-Out Pummeling (190 BP) vs. 248 HP / 8 SpD Eviolite Chansey: 290-342 (41.2 - 48.6%) -- 74.2% chance to 2HKO after Stealth Rock
accept it this is the new wave