Empoleon should use Agility in somewhere. EV's should be 156 Hp / 252 SpA / 92 Spe ; since after one Agility you outspeed most Base 110's and lower.
As said , Yanmega is better.
• Yanmega @ Choice Specs / Life Orb
• Tinted Lens / Speed Boost
• 4 Hp / 252 SpA / 252 Spe
- Bug Buzz
- Shadow Ball
- Air Slash
- Hp [Ground] / Hypnosis
You have two Ability's to choose from here , but on a Specs set Tinited Lens is better since you still hit everything for neutral damage atleast.
Tell me how you feel? I feel like the grass is green