I'd get Zebstrika, myself. It's a fast Pokemon that would balance the range of Speed stats on your team, and also provides that nice Fire-type coverage in Flame Charge.
It can have the ability Motor Drive to absorb Electric-type attacks and raise Speed, or Sap Sipper to switch in on Grass moves to receive an Attack boost, making it great for switching around on a team.
Emolga's got a sweet typing, but there are next to NO Ground-type attacks in the game after you beat Driftveil's gym, so it's not like Emolga's Flying-typing is doing it any justice, really, except for a Fighting resistance.