So, I was walking around vulcan island, and some trainers that i had already fight, wanted to fight again without wating the 7 day cooldown. Trainers are: the no-name redhead girl from vulcan forest and Xenonm from Vulcan path. Dont know if more trainers too, I havent tried.

Do you noticed that trainers at vulcan island have more then One NPC at the same place? Thats os because at the last year the vulcan island had multiple regional for exemple if u enter at the island by janto the pokémons are kanto but if you enter by jhoto last year the pokémons are from jhoto. This os not the case they are now all kanto. But they dont removed ter the trainers. Thats why they trigger when you go by other region.

Do you noticed that trainers at vulcan island have more then One NPC at the same place? Thats os because at the last year the vulcan island had multiple regional for exemple if u enter at the island by janto the pokémons are kanto but if you enter by jhoto last year the pokémons are from jhoto. This os not the case they are now all kanto. But they dont removed ter the trainers. Thats why they trigger when you go by other region.

I have not left the island since I entered

So that is different . Sory about that then. I just tried to help.