Like the facilities in Pokémon Emerald, each Battle Frontier building as its own leader whom you battle twice to get medals and even more Battle Points than normal.

First Battle

Once you reach a streak of 50 in the Battle Hall, when you go to have your 50th Battle, you will be challenged by the Frontier Brain of the Battle Hall; Argenta. Her Pokémon's level match your own. Going in the spirit of the Battle Hall, she doesnt have 1 set Pokémon, but rather a random one from any type. Beat her and you get the Silver Medal

Hall Matron Argenta

Streak 50
Second Battle

Continue in on the streak and continue to beat all the Pokémon. Beat Rank 10 on every type for Argenta to appear. This is a lot harder than it sounds as when you get to Rank 7, the Pokémon will start to have attacks that are super effective on you, and as you cannot switch Pokémon mid-campaign, this gets really difficult and is nigh-on impossible. Make sure you have a strong range of attack types to succeed

Hall Matron Argenta

Streak 170

Battle Arcade Frontier Brain

First Battle

Once you reach a streak of 21 in the Battle Hall, when you go to have your 21sth Battle, you will be challenged by the Frontier Brain of the Battle Arcade; Dahlia. Her Pokémon's level match your own. She has a set team in here so your strategy needs to be augmented by the choice in the Roulette. For example, make it so her Pokémon are losing health each turn. Beat her and you get the Silver Medal

Arcade Star Dahlia

Streak 21
Dusknoir Medicham Ludicolo
Second Battle

Continue in on the streak and continue to beat all the Pokémon. Once you get to your 49th Battle, you will be challenged again by Dahlia. Her Pokémon style has changed and now include legendaries. The options you have on the roulette are also increased but sped up so it adds even more difficulty

Arcade Star Dahlia

Streak 49
Zapdos Blaziken Togekiss

Battle Castle Frontier Brain

First Battle

Once you reach a streak of 21 in the Battle Castle, when you go to have your 21sth Battle, you will be challenged by the Frontier Brain of the Battle Castle; Darach. His Pokémon's level match your own. The team he has is not the strongest you will face, but based upon your past battles, if you do not spend CP to heal, you will struggle. Beat him and you get the Silver Medal

Castle Valet Darach

Streak 21
Staraptor Empoleon Houndoom
Second Battle

Continue in on the streak and continue to beat all the Pokémon. Now you have the option to skip battles for 50CP, you may be able to get through it even quicker, should you earn points wisely anyway. As always, the trainers get stronger so you have to be prepared. Once you hit your 49th battle, Darach will re-appear. Beat him to get the Coloured Medal

Castle Valet Darach

Streak 49
Entei Gallade Empoleon

Battle Tower Frontier Brain

First Battle

Once you reach a streak of 21 in the Battle Tower, when you go to have your 21sth Battle, you will be challenged by the Frontier Brain of the Battle Tower; Palmer. His Pokémon's level match your own. The team he has is pretty strong with good defenses so plan a team that can easily defeat his. Beat him and you get the Silver Medal

Tower Tycoon Palmer

Streak 21
Dragonite Milotic Rhyperior
Second Battle

Continue in on the streak and continue to beat all the Pokémon. As you go through, the Pokémon you face continue to get stronger and have an advantage over you. Once you reach a streak of 49, Palmer will appear and re-battle you. This time he has three very strong legendary Pokémon. Beat him to get the Coloured Medal

Tower Tycoon Palmer

Streak 49
Heatran Regigigas Cresselia

Battle Factory Frontier Brain

First Battle

Once you reach a streak of 21 in the Battle Factory, when you go to have your 21sth Battle, you will be challenged by the Frontier Brain of the Battle Factory; Thorton. His Pokémon's level match your own. As he uses rental Pokémon, you'll never know what you're going to be in for so use your best judgment. Beat him and you get the Silver Medal

Factory Head Thorton

Streak 21
Second Battle

Continue in on the streak and continue to beat all the Pokémon. As you go through, the Pokémon and the attacks you use will get stronger, but so will the opponents. Be sure to switch Pokemon if you have weak ones in your team. Once you reach a streak of 49, Thorton will appear and re-battle you. Again, he uses rental Pokémon. Beat him to get the Coloured Medal

Factory Head Thorton

Streak 49
 
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