Here are some pretty good Electric types that you can pick for your team:
Raichu: With 90 Attack and Special Attack and 110 Speed, you'll be able to outrun most of the in-game Pokemon and hit them moderately hard with moves like Thunder, Volt Tackle and Thunderbolt. Make it hold a Light Ball as it boosts it's Attack and Special Attack and can breed Volt Tackle onto Pichu. In X&Y, Pikachus have a 5% chance of holding it.
Jolteon: Jolteon has 110 Special Attack and 130 Speed, and with the hidden ability Quick Feet you can make good usage out of it. It utilizes its Sp. Atk with moves like Thunder, Thunderbolt, and Discharge.
Ampharos: With the ability to Mega Evolve, a nice Sp. Atk of 115, and okay defensive stats of 90/85/90, this slow but powerful Pokemon has access to moves like Zap Cannon, Thunder, Discharge and Dragon Pulse for its Mega Evolution, Ampharos can serve a monotype electric team quite nicely.
Manectric: Another Pokemon with the ability to Mega Evolve, this Pokemon with the Sp. Atk and Speed stats of 110 can make a nice special sweeper with a diverse movepool that includes Iron Tail to counter pesky ground types and Crunch. It's mega evolution gains the ability Intimidate and its Sp. Atk and Speed increases by 20, making it a great Pokemon to have.
Luxray: A strong physical attacker with an Attack stat of 120, Luxray can dish out serious damage with moves like Wild Charge and Thunder Fang. Rivalry can increase his base attack up to 150 (or lower it to 90), or Intimidate is always nice as well.
Magnezone: It has a Special Attack of 130, and Defense of 110. A STAB Zap Cannon or Gyro Ball from this thing WILL hurt. However, it doesn't make much good use competitively.
Heliolisk: With a Speed and Special Attack stat of 109, and an electric move that heals like Giga Drain, Heliolisk is a great Pokemon with only two weaknesses to Fighting and Ground. A STAB Hyper Beam can really pack a punch and Electrify is great as it makes moves Electric, so you can have an Electric-Type Dig or an Electric-Type Focus Blast, two moves which normally don't get STAB.
Secondary Electric Types:
Lanturn: Volt/Water Absorb is always nice along with Aqua Ring, but it only has 76 Special Attack, Abysmal Physical Attack, and mediocre defense stats (besides HP which is at 120)
Electrivire: A physical Pokemon with a not-very-physical movepool. However, it can learn Earthquake and other physical moves from TMs.
Eelektross Not much is known about it in X & Y yet, but as it has no weaknesses and offensive stats of 115/105, it should be good for a monotype team.