The Battle Chateau, one of the battling facilities in Kalos, is a mansion situated on top of a river on Kalos Route 7.
Grand Duke/Grand Duchess
The Battle Chateau features rematch battles against gym leaders you have previously defeated.
Calem/Serena is greeted by Viola, who talks one of the servants of the Battle Chateau into giving them a beginner's noblity rank. Battling other nobles who show up (either on their own or because of Writ being sent out to invite them for battles), Caliem/Serena can raise his/her rank through countless battles.