Note that I have not finished battling, meaning I have not lost yet. I just never got around to continue the streak. I stopped after 112 wins.
This is my Battle Tower team.
EV: 252 HP / 252 Defense / 6 Sp. Attack
- Ice Beam
Item: Lum Berry
EV: 252 HP / 252 Attack / 6 Speed
- Meteor Mash
- Bullet Punch
Item: Yache Berry
EV: 6 HP / 252 Attack / 252 Speed
- Dragon Claw
- Fire Fang
- Swords Dance
My basic strategy is to put something to sleep with Hypnosis, switch in Garchomp and use Swords Dance, twice if possible, then proceed to sweep. Metagross is back up in case Garchomp falls, and Explosion to take out any legendary threats.