(Can someone answer the above question?)
Anyway, I realized something about the regional dex which helps us know something about the region. In the first pic about splitting the dex into three, they gave us numbers that were something like 77 in the central dex, 51 in the coastal, and 6 in the mountain. Also, many of us think that the Coastal side of the region is the west, and the Mountain side is in the east. If this is true, it gives evidence that we'll be able to go to west side of the region first, probably from Lumiose, and then go to the east later.