Honestly i have always run 252/128/128 careful. 330 on both defenses is just good enough to take the hits youre supposed to. Here are some calcs to show:Aerial Ace, bro. You won't get a full power Acrobatics with an item (Flying Gem Scizor is a BAD gimmick), so just run Aerial Ace instead.
Anyways, how do you guys EV Ferrothorn? The old spread, 252 HP / 88 Def / 168 Sp Def is really old, and since avoiding +1 Haxorus EQ isn't relevant anymore, given that Haxorus has Superpower now and is horribly outclassed at DD sets, what are some good defensive benchmarks for Ferro?
252+ SpA Choice Specs Politoed Hydro Pump vs. 252 HP / 128+ SpD Ferrothorn in rain: 135-159 (38.35 - 45.17%) -- guaranteed 3HKO
252+ Atk Choice Band Dragonite Earthquake vs. 252 HP / 128 Def Ferrothorn: 131-155 (37.21 - 44.03%) -- 99.98% chance to 3HKO
252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 128+ SpD Ferrothorn: 123-144 (34.94 - 40.9%) -- 65.23% chance to 3HKO
It also has enough bulk to survive scarf terrakion close combat, specs keldeo secret sword etc.