The Battle Tower, arguably the biggest part of the Battle Frontier, however this isnt tournements, a tunnel, Random Pokémon. It's just pure continuous battling. However it Has 4 Modes of Play

First Mode - Single Battles

This is a standard set of battling. You pick 3 Pokémon for your team and battle the standard Way
You battle in 7 Straight Sets til you get let out again Rules No Legendaries Lv. 50 or Any Level The Level in Any Level matches your top Pokémon Level No Entry of 2 Pokémon with same items

Second Mode - Double Battles

This is a standard set of battling. You pick 4 Pokémon for your team and battle the Double Way
You battle in 7 Straight Sets til you get let out again Rules No Legendaries Lv. 50 or Any Level The Level in Any Level matches your top Pokémon Level No Entry of 2 Pokémon with same items

Third Mode - True Double Battles

This is a way of Battling you have only had once before in the game, when fighting with Steven against Team Magma in the Space Center. First you pick 2 Pokémon to use (yep only 2), and then you get taken to the left. In it you get put into, a Union Room of sorts where there are several computerised Trainers. Pick one and you'll get taken to the battle room
You battle in 7 Straight Sets til you get let out again Rules No Legendaries Lv. 50 or Any Level The Level in Any Level matches your top Pokémon Level No Entry of 2 Pokémon with same items And Remember, you need to work with your computer team mate to defeat your opponents.

Fourth Mode - True Wireless Double Battles

This is where things get even more interesting. You need Wireless Adaptors and friends to do this. When you have signed up your 2 Pokémon it'll search for a Wireless Connection, once on has been established you'll be taken to a true Battle Tower Union Room. Here is where you pick your team mate for battling. The rest is all the same as the third mode
You battle in 7 Straight Sets til you get let out again Rules No Legendaries Lv. 50 or Any Level The Level in Any Level matches your top Pokémon Level No Entry of 2 Pokémon with same items And Remember, you need to work with your team mate to defeat your opponents. It'll help to be next to him/her to strategise

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:

Salon Maiden Anabel	Alakazam	Entei	Snorlax
Battle Type Items	Level 50	Level 50	Level 50
	Attacks: Thunder Punch Fire Punch Ice Punch Disable	Attacks: Fire Blast Calm Mind Return Roar	Attacks: Body Slam Belly Drum Yawn Shadow Ball
	Hold Item: Bright Powder	Hold Item: Lum Berry	Hold Item: Quick Claw

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

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Salon Maiden Anabel	Raikou	Snorlax	Latios
Battle Type Items	Level 50	Level 50	Level 50
	Attacks: Thunderbolt Calm Mind Reflect Rest	Attacks: Psychic Dragon Claw Calm Mind Recover	Attacks: Curse Return Rest Shadow Ball
	Hold Item: Lum Berry	Hold Item: Bright Powder	Hold Item: Chesto Berry
			Tera Type