To be completely honest with you, anything can work in-game if you level it up enough. Emolga is found early on Route 5, 6 before Skyla, so you can obtain it. It's Ability in Static isn't bad by any means, but it's attacking stats are lackluster at 75 each. While it's attacking moves consist of Electro Ball, Pursuit, Acrobatics and Volt Switch by Level up (No need for Spark or Quick Attack) and Thunderbolt, Facade, U-Turn and Hidden Power by TM, there is enough coverage to do, but not extraordinary.
So, Emolga is by no means not viable, so go ahead and use it if you want, especially if you don't want to use any of the other Electric types available.