Maximum HP is a must on any Skarmory to allow it better walling capabilities against both special and physical attacks. 64 Attack EVs allow Skarmory to 2HKO offensive Gyarados if it has taken Stealth Rock damage (assuming Skarmory has not been Intimidated) and will also OHKO Infernape switch-ins. The given Attack EVs also allow Skarmory to KO most Lucario after a Defense drop from Close Combat and one Life Orb recoil. 16 Speed EVs grant Skarmory the ability to outrun maximum Speed Adamant Rhyperior, allowing it to Roost stall its Stone Edge. The remaining EVs are delegated to Defense.