You can see it if you compare Sawyer and Ash badges. They have the same 5 badges. But they have each 3 distinct badges to each other. Meaning 5 + 3 + 3 = 11.
There are 11 confirmed Gyms in Kalos. Further proving the theory that there are more than 8 Gyms in each region. Even if the league conference only requires 8 badges to enter.
Well, not the first time happened. Since even at the start in Kanto Region. Gary displayed he has 10 Kanto Badges. Some of which Ash doesn't have in his own 8 Kanto Badges.
by Wonderful-Photo-9938