One option is to teach Dewott and Scraggy the Dig TM however it will only be effective against Elesa's Zebstrika since Dig being a ground-type move, it will not be able to hit her Emolga due to them being part Flying. Leavanny would be a good option against her Electric-types as well however she's thought of this and both of her Emolga know Aerial Ace, a Flying-type move which will be twice as effective on Leavanny. You can also teach any of the 3 a Dragon-type move which will help against Elesa.
Other options would include catching a Blitzle since that would help you out against Volt Switch that Emolga and Zebstrika will both know since regardless of whether the captured Blitzle has the Motor Drive ability or the Lightningrod, it cannot be hit by Electric attacks and it will raise one of your attacks during the battle as long as it remains in the battle without being switched out.
Another option would include catching a Roggenrola since due to it being a Rock-type, Electric-type attacks and Flying-type attacks will not be as effective on it.
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The Unova gym leaders are; !st gym: Cilen, Chili, and Cress 2nd gym: Lenova 3rd gym: Burgh 4th gym: Elesa 5th gym: Clay 6th gym: Skyla 7th gym: Brycen 8th gym: Drayden(pokemon black) and Iris(pokemon white)
The first: Cilan, Cress or Chili...Types: Grass Water Fire Lenora (Aloe) Normal Burgh (Arti) Bug Elesa (Kamitsure) Electric Clay (Yacon) Ground Skyla (Fuuro) Flying Brycen (Hachiku) Ice Drayden(black) or Iris(white) (Shaga or Airisu) Dragon
After you defeat the 4th gym leader, Elesa, you can go into the Lostlorn Forest, there you will encounter a level 25 Zoroark (female). You can capture her and breed her to get a Zorua.
It is in The Amusement Park. Firstly talk to N and go on The Ferris Wheel with him. Then when you come off Team Plasma will be outside. Battle N and then walk to the other building with Roller Coasters and at the end Elesa (the gym leader) is waiting. She uses two Emolga's who keep using volt switch between each other and then she uses Zebstrika. They are both Electric Pokemon. Emolga is weak to Rock and Ice and Zebstrika is weak to Ground Type Pokemon. It is the Forth Gym Badge. Hope this helped ya :)!