Hadn't really used Assault Vest Goodra much, but liked the mon. Got curious, did calcs:

+2 252 SpA Adaptability Mega Lucario Flash Cannon vs. 252 HP / 4 SpD Assault Vest Goodra: 172-204 (44.7 - 53.1%) -- 26.6% chance to 2HKO

+2 252 SpA Adaptability Mega Lucario Flash Cannon vs. 252 HP / 4 SpD Blissey: 282-334 (39.4 - 46.7%) -- guaranteed 3HKO after Leftovers recovery

Dear god, look at these calcs. Why aren't people using this monster more often??