I'd go with Eelektross.
It has brilliant Attack and Special Attack, decent defenses and HP. The only stat that's bad is Speed. It has a great movepool and also has the highest stat total of all the non-legendary Electric types in the Unova region (515).
If you want a physical attacker, you should go with:
Eelektross @Flying Gem
Nature: Adamant (+Atk -SAtk)
EVs: 252 Atk, 100 Def, 100 SDef, 56 HP
And if you want a special attacker, go with:
Nature: Modest (+SAtk -Atk)
EVs: 252 SAtk, 100 Def, 100 SDef, 56 HP