Quoted By:
drapion @ scope lens
sniper
252 ATK / 24 or 72 SPE / rest in HP
cross poison
night slash
EQ
Agility
stabs hit everything but steels which get earthquaked, 25% chance of a crit for 300% is better overall than 33% chance of a crit for 200%
24 speed EVs will outspeed +1 max speed jolly landorus-T and everything below (base 90's) after an agility, while 72 speed EVs will outspeed +1 jolly/timid max speed base 100's (DDmence)
or add more to outspeed other things like scarf terra
rest go in HP to help set up agil with dat 70/110/75 bulk
you might switch EQ for an elemental fang in order to take care of dragons or ground-neutral steels though, or even a double dance set