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.
I'm feelin' electric tonight
Cruising down the coast goin' 'bout 99
Got my bad baby by my heavenly side
I know if I go, I'll die happy tonight