My streak at single battle was twenty. It was broken quite easily by Nita, though. Her team consisted of Wigglytuff, Purugly, and Grumpig, and my team had Talonflame, Scizor, and Dusknoir. I was able to defeat Wigglytuff with my Scizor, somehow, but Grumpig and Purugly… they were just impossible to get through. ): With the help of Purugly, she was able to have my Dusknoir and Scizor taken down. Scizor was able to reduce Purugly's health a bit before fainting, so Talonflame was able to finish off the job after being sent out on the field. That didn't matter, though, because in an instant, her Grumpig was able to destroy Talonflame with only one attack.
I'll make sure to be as prepared as I can when I challenge Nita again. Next time I visit Battle Maison, I'll most likely be having Krookodile, Blissey, and Chesnaught on my team. With Krookodile, I should be able to defeat her Grumpig and Wigglytuff, as they're both weak to dark. Purugly—I should be able to have it beaten with my Chesnaught, since it's got access to a lot of fighting-type moves. Blissey will be there just in case I need any support.