Aura Sphere on Raikou really isn't worth it. Specially Defensive Ferrothorn isn't even 2HKOed, Tyranitar a 4x weak isn't OHKOed either and you lose out on Raikou's great speed which is the #1 reason it's good and you're outsped by the Lati twins, Keldeo, Terrakion, Mega-Pinsir, Gengar and...