Ferrothorn only requires 252 HP and 84 Defense EVs to always survive an unboosted Close Combat. It also only requires 156 Attack EVs to OHKO Terrakion with Power Whip, so a good spread could be 252 HP / 172 Atk / 84 Def Brave, or you could just slap on a Chople Berry and go 252 HP / 252 Atk / 4 SpD Brave, which is the best option in my opinion, although the ubiquity of Chandelure does make the lack of Occa annoying.
EDIT: I didn't factor in CC's Defense drop, so the above is false. Give me a second to revise this.
EDIT2: OK, Ferrothorn doesn't need any Attack EVs to OHKO a Terrakion with Power Whip after Terrakion's used Close Combat, BUT since some (not many, but enough to make it something to watch out for) use Sacred Sword, which doesn't lower defenses, the >=156 Atk EVs should be mentioned if you want a spread that can take a CC and OHKO with Power Whip.
EDIT3: Gyro Ball OHKOs even without the Defense drop, sorry about that. Have you tried a Choice band set, by the way?
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Last edited by cosmicexplorer; May 18th, 2011 at 9:23:41 PM.