Because there is seemingly no Alolan Exeggcute, does this mean

they showed a regular exeggcute evolve into a alonan exeggutor in the japanese trailer

>>27469341
It probably automatically evolves into Alolan. Unless it's transferred from another region?

Evolves into Alolan and there's a specific place to evolve it to a regular one.

>>27469496
100% sure that it's going to work like this. An Exeggcutor transfered from another region will be same as always but one thay evolves in game will turn into it's Alolan format. Same could probably go for Vulpix in that sense.

>>27469446
Honestly? Link please?

You need an Imported Leaf Stone to evolve it into the old form. In later games, it will be an Alolan Leaf Stone to evolve it into its Alolan form.

>>27469341
The Alolan forms are the only ones in the game. You can't get the original versions in Sun and Moon, you have to transfer them if you want them.