Once you reach Master Class in the the BDSP Battle Tower, you begin to face Boss Trainers once every 7 battles. When you defeat a Boss Trainer, you move up 1 rank, until you reach Rank 10.

The 8 Sinnoh Gym Leaders are the Bosses of Ranks 1-8. Cynthia is the Boss of Rank 9, and finally Palmer is the Boss of Rank 10.

My question is, once you Reach Rank 10 and defeat Palmer, what happens after that? Do you only encounter Palmer there, because he is the Rank 10 o, or do you also occasionally get to battle the previous 9 Bosses too? It would feel very disappointed if you never get to battle them again.

I appreciate the help, guys.