|South Exit: Route 7
As you travel along Route 7, you will find a lone building. This building is the Battle Chateau and, when you enter it, you will meet up with Korrina who explains it. This building is filled with trainers that change every few hours. Your task here is to battle the various trainers each day.
As you progress, your own personal rank will increase. You start off as a Baron/Baroness, then a Viscount/Viscountess, then Earl/Countess, then Marquis/Marchioness, Duke/Duchess and then finally Grand Duke/Duchess. As you rank up, the Chateau will draw more and more trainers who wish to battle you in each visit. On the odd occassion, a new trainer will enter the building as you're battling through.
On the odd occasion when you're at the top level, you may find gym leaders such as Korrina here to battle. These appear once you reach the rank of Maquis/Marchioness. Once you become a Duke/Duchess, the Elite Four start to appear.