The Battle Frontier has 7 Leaders, like Gym Leaders called the Frontier Brains Trust. And Like Gym Leaders they have Seperate Sprites and Seperate Teams. Here is a List of them and their 2 sets of teams. You can only battle them in the 1 VS 1 modes

Battle Dome

At the end of your 5 Consecutive Wins in Tournements (A Total of 19 Battles) (1 on 1 Only) you get challenged by the Dome Leader. Beat him and you shall get the Silver Battle Dome Badge:

Dome Superstar Tucker
Swampert Salamence Charizard

At the end of your 10 Consecutive Wins in Tournements (A Total of 39 Battles) (1 on 1 Only) you get challenged by the Dome Leader. Beat her and you shall get the Gold Battle Dome Badge:

Dome Superstar Tucker
Swampert Latias Metagross

Battle Pike

At the end of your 28 Consecutive Wins or Room Completions, you got notified by the owner about the trainer, go to the far right room and you'll be challenged by the Pike Champ. Beat her for the Silver Battle Pike Badge:

Tube Queen Lucy
Seviper Milotic Shuckle

At the end of your 140 Room Completions, you got notified by the owner about the trainer, go to the far right room and you'll be challenged by the Pike Champ. Beat her for the Gold Battle Pike Badge:

Tube Queen Lucy
Seviper Gyarados Steelix

Battle Arena

After 27 Straight Battles & Wins (1 on 1 Only) , the Arena Captain appears and challenges you. Beat her and you get the Silver Battle Arena Badge

Arena Captain Greta
Heracross Umbreon Shedinja

After 56 Straight Battles & Wins (1 on 1 Only) , the Arena Captain appears and challenges you. Beat her and you get the Gold Battle Arena Badge

Arena Captain Greta
Umbreon Gengar Breloom

Battle Factory

After 21 Battles in the Battle Factory (1 on 1 Only), you will get challenged by the Battle Factory champion, beat him and you'll get the Silver Battle Factory Badge:

Factory Head Noland
Grovyle Octillery Omastar
Note; Above is the team we battled. Chances are like everyone else in the Battle Factory, Noland's team is completely random

After 42 Battles in the Battle Factory (1 on 1 Only), you will get challenged by the Battle Factory champion, beat him and you'll get the Gold Battle Factory Badge:

Factory Head Noland
Espeon Venusaur Nidoking
Note; Above is the team we battled. Chances are like everyone else in the Battle Factory, Noland's team is completely random

Battle Palace

After 21 Consecutive Wins (1 on 1 Only) you get challenged by the Palace Leader. Beat him and you shall get the Silver Battle Palace Badge:

Palace Maven Spenser
Crobat Slaking Lapras

After 42 Consecutive Wins (1 on 1 Only) you get challenged by the Palace Leader. Beat him and you shall get the Gold Battle Palace Badge:

Palace Maven Spenser
Arcanine Slaking Suicune

Battle Pyramid

At the end of your 21st Floor you get challenged by the Pyramid Leader. Beat him and you shall get the Silver Battle Pyramid Badge:

Pyramid King Brandon
Regirock Regice Registeel

At the end of your 70th Floor (Through it 10 times) you get challenged by the Pyramid Leader. Beat him and you shall get the Gold Battle Pyramid Badge:

Pyramid King Brandon
Articuno Zapdos Moltres

Battle Tower

After 35 Consecutive Wins (1 on 1 Only) you get challenged by the Tower Leader. Beat her and you shall get the Silver Battle Tower Badge:

Salan Maiden Anabel
Alakazam Entei Snorlax

After 70 Consecutive Wins (1 on 1 Only) you get challenged by the Tower Leader. Beat him and you shall get the Gold Battle Tower Badge:

Salan Maiden Anabel
Raikou Snorlax Latios