Elekid cannot be caught in X and Y, but it can be caught on Mirage Mountain (South of Route 129) in Omega Ruby and Alpha Sapphire. To get Electabuzz, you have to get him from a Friend Safari in X and Y, or evolve Elekid to level 30. Then you trade him holding an Electirizer to turn him into Electivire.
Elekid Electabuzz Electivire
The best Ability for Electivire in my opinion is Vital Spirit. I know it is hard to get since it is a Hidden Ability, but it has more use than Motor Drive. What Motor Drive does is when he is hit by an Electric Type move, his speed goes up by one stage. That's not too bad of an Ability, but nobody would really use an Electric Type attack on Electivire. Vital Spirit keeps him from falling asleep, which is considerably more useful.
A good moveset for it in my opinion is Electric Terrain, Thunder Punch, Wild Charge, and Thunder. Electric Terrain because it will make Electric Type moves 50% more effective for 5 turns. Thunder Punch because he has a high Attack stat and he'll get a STAB from this move. Wild Charge for the same reasons as Thunder Punch. Finally, Thunder is on the list because it is just so powerful (when it hits).
One of the best items for it to hold is the Wide Lens. I know this is a weird choice, but with a move like Thunder (which almost never hits because of the terrible accuracy) the Wide Lens helps by boosting accuracy by 10%.
So that's how I'd use Electivire! Be sure to leave alternate ways to use Electivire or a suggestion for next week's Pokemon of the Week in the comments!