Knock off is mostly used to remove chansey's eviolite and for gengar but if you do opt for knock off run quiet since mega venusaur's a tank anyway.Reading the Venusaur Offensive set, it says to put speed and special defense EV into attack if you use Knock Off. Would the new spread be 232 HP / 24 Atk / 252 SpA or 232 HP / 8 Atk / 252 SpA / 16 Spe ? The 28 HP Gengar mention is where I am confused since I would need 20 Atk to have a 50% to OHKO after Stealth Rocks but won't be at the same speed.