So, I finally reached 49 consecutive wins in the Sinnoh Battle Tower, and I unlocked Master Class. However, I noticed 2 strange things:

1. Nobody informed me that Master Class has been unlocked. I just went and tried it myself and it was indeed unlocked. In previous games we had the receptionist tell us that.

2. I decided to also check if Master Class Double Battles were unlocked, and indeed they were! But the strange thing is that I never did regular Double Battles to unlock Master Class Doubles. Does this mean that by beating Singles, you unlock both Master Class Singles and Master Class Doubles? It wasn't like that in previous games, iirc?