Like in Emerald, battling in the Battle Tower will give you Battle Points that you can spend on a variety of things in the building just South of the Battle Tower. However there are 18 Pokémon that are not usable inside the Battle Tower. They are as follows;

Standard Battles

In the middle door is where Standard Battles occur. These can be in both Single and Double Battle mode allowing for you to test your Pokémon on some of the strongest computer players. The more you win in a row without a loss, the harder they get. However in Single Battle mode, like in Emerald, you will get to battle the Tower Tycoon on several occassions. The Tower Tycoon is one of the strongest trainers ever and requires some serious strategy and if you manage to beat him, you will get 20 BP. Below are his teams;

On 21st Consecutive Battle

Tower Tycoon Palmer	Dragonite	Milotic	Rhyperior

On 49th Consecutive Battle

Tower Tycoon Palmer	Heatran	Regigigas	Cresselia

The final mode is the Multi Battle Mode. This mode allows you to team up with a friend via the DS Wireless Play function and tackle the Battle Tower as a team. However if you do not have any friends nearby or at all, fear not! There is a single player mode which allows you to team up with the trainers that you were teamed up with earlier in the game, provided of course you have done that event, Click Here for Locations. Going into a room with the 5 trainers in, you will be able to go up to them and talk to them. This will allow you to pick them to join you. However they do not just have the Pokémon they had when you had them earlier, they have a choice of many Pokémon, some of which may have multiple movesets and below are the Pokémon you may battle with if you select them: