In Nimbasa City, next to the Pokémon Centre is a building known as the Battle Institute. This building, open only when you have defeated the Elite Four, will allow you to test your teams out against a variety of trainers. There are two modes for you to test your teams in; Single Battle and Double Battle. Unfortunately, there are no options available for testing Triple Battle & Rotation Battle teams.
The Battle Institute has the same Pokémon restrictions as the Battle Subway, preventing the strongest legendary Pokémon from being entered.
The task here is to select your team, 3 Pokémon in Single Battles and 4 Pokémon in Double Battles. You will face up against 5 consecutive trainers and will move on to the next battle regardless of if you win or lose the battle. Each team gets progressively more difficult to defeat and start using stronger and more in-depth strategies in order to provide even more of a challenge.
There is also a download option which will allow for the download of special training scenarios through the Pokémon Global Link over the Nintendo Wi-Fi Connection. We'll bring details on the WiFi training scenarios as and when they're announced.