The Battle Tower is a facility in the Pokémon video game series where players can challenge a series of battles against AI trainers. It tests players' skills and strategies without the use of their own Pokémon teams, as they must use rental Pokémon provided by the facility. In the Battle Tower, players face increasingly difficult opponents, earning points and rewards based on their performance. This feature is popular among fans of competitive play, as it allows for practice and experimentation with different Pokémon types and moves, enhancing the overall gaming experience.