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These badges appeared for the first time in XY&Z series after Zygarde core was introduced and we saw them not once but twice (or even more im not too sure). I know we had several anime-only badges in the past but these ones are very good design-wise, its easy to guess which type they represent (unlike other anime badges) and we visited every region at least twice in the games - except for Kalos.
We do know that Zygarde forms are indeed in the games and will appear "in a special way that will make people excited". What if we'll go back to Kalos in the postgame of Sun and Moon and those are the gyms now in Kalos?
Afterall Zygarde pokedex entry ties him to Kalos quite strong.
Also small detail but on E3 Masuda said we'll see those forms in Sun and Moon but he never mentioned we'll see them in Alola. In the trailer we see Zygarde in a canyon area just like Solgaleo and Lunala but that wouldnt make much sense unless we assume we can encounter wild lv 50 Gengar, Metagross, Salamence and Garchomp. The trailers are often very misleading (lvl 50 Eevee alongside Magearna sounds a bit unusual aswell)
