The backpacker who hinted a region that was not Kanto-Kalos and gave us a strange souvenir.
No, it seems to be something you can do anywhere with friends, maybe in whatever the PSS-like will be this gen.
>>26795108
But Battle Maison has some online connectivity already.
Battle Royal totally looks like it's own facility. It has four entrances shaped like Charizard, Gyarados, Tyranitar, and Haxorus. Also, it has a red, blue, yellow, green colored arena. Those are design aspects which I think will not be in the arena for Battle Spot/online battles.
3/4 have megas, mega haxorus confirmed.