Who are the Gym Leaders in Pokemon Omega Ruby and Alpha Sapphire?

The Gym Leaders in Pokémon Black and White are Cheren, the Gym Leader of your home city, Aspertia City. Cheren uses Normal-types. Roxie, the Gym Leader of Virbank City, she uses Poison-types.

The third leader is Burgh of Castelia City, he uses Bug-types. His party consists of Swadloon, Dwebble and Leavanny with his Leavanny being the highest one level-wise because it's Level 24.

The fourth Gym Leader is Elesa of Nimbasa City, she uses Electric types. Her party consists of Emolga, Flaaffy and Zebstrika.

The Fifth Gym Leader is Clay of Driftveil City and he uses Ground-types. His party consists of Krokorok, Sandslash and Excadrill.

The Sixth Gym Leader is Skyla of Mistralton City and she uses Flying-types. Her party consists of Swoobat, Skarmory and Swanna.

The 7th Gym Leader is Drayden of Opelucid City and he uses Dragon-types which would include his party Pokémon of Druddigon, Flygon and Haxorus.

The 8th and final Gym Leader is Marlon of Humilau City, he specializes in Water-types and his party Pokémon are Carracosta, Wailord and Jellicent.