Battle Tower FAQ:

Basic Definition: The Battle Tower is the basic battle facility. You simply battle 7 trainers 3v3 to win a set, and nothing more.

Difficulty: 5th of 7 on easiness scale (Hard)

Team: Latios @ Lum Berry: Calm Mind, Psychic, Dragon Claw, Thunderbolt
Swampert @ Leftovers: Earthquake, Surf, Ice Beam, Counter
Metagross @ Choice Band: Meteor Mash, Earthquake, Shadow Ball, Explosion

Manipulation: None. You could technically double frame perfect clear to manip the first fight, but it's both ridiculous and not worth it to do so.

The Tower is basic, but it is also the longest facility, making a death not only painful, but very possible just because of the sheer length you have to go without having some bullshit happen.