The RPG developed for Nitendo 3DS platform- Pokemon Omega Ruby & Alpha Sapphire is the 4th generation game in the Pokemon Series. Here are the tips for you to earn the Gym Leader badges. The guide will help you defeating each gym leader you'll also earn some extra benefits in the game.
Dewford Town Gym
Brawly is the trainer at Dewford Town Gym. There are fighter Pokemon over here. you must use the one with fairy, psychic and flying abilities. Brawly is one of the easiest targets to defeat in Pokemon Omega Ruby & Alpha Sapphire. He uses level 14 Machop and level 16 Makuhita both of them have least threat when used alone. One can use Taillow and Torchic for they good flying and attacking abilities. Defeating Brawly will earn you Knuckle Bag that makes all Pokemon up to level to follow your orders and TM08: Bulk Up.
Mauville City Gym
At Mauville City Gym they use Pokemon with Electrical powers. Wattson is the trainer here. You can use ground type Pokemon. A level 19 Magnemite, level 19 Voltorb, level 21 Magneton are Wattson's Pokemon. They are Fire and fully electric types and are equipped with Volt Switch. You can have Nincanda and Geodude against him. Try and use all the types of attack and do not use any flying or water type Pokemon for defeating Wattson. Get Dynamo Badge that unlocks new items to purchase and get the ability to use Rock Smash outside of battle and dominate over all Pokemon under level 40 after winning Mauville City Gym.
Fortree City Gym
Winona the trainer at Fortree City Gym uses level 33 Skamory ,Swellow and Pelipper of the same level. Her fourth Pokemon level 35 Altaria. All of them are having ability to give flying damages. level 35 Altaria can give powerful earthquake which causes damage to the ground level electric type Pokemon. You must use Cosplay Pickachu or Elecktrick. Do not use rock type first instead use electric type initially and then the rock on. A Feather batch that makes Pokemon upto level 70 to obey your orders. You can also use the Fly outside battle and TM90.
Mossdeep City Gym
Mossdeep City Gym is filled with many strange people, teamed up with the trainers Liza and Tate. This gym uses psychic type of the Pokemon. Be ready with a dark type, well- trained Pokemon. They use level 45 Lunatone and Solrock against whom you can use the pair from your set of Pokemon. Both of them have ability that keeps them immune from ground attacks. You can pair up Dark Pulse and the Feint Attack to beat them. You'll earn a Mind Badge, helping you to control all the Pokemon upto level 80. Earn TM for Calm Mind and can use Dive outside the battle.