I've noticed the sightseer trainer class has only Pokemon with regional variants. (Rattata, Raichu etc.) What I was wondering was are there any Pokemon that don't have regional variants (For example Cloyster and Dragonite.) and if there are, what Pokemon do they use that don't have regional variants and which trainers are they.
There is one. Sightseer Marcus has a Exeggcute which is not Alolan, but Exeggcute later evolves into Alolan Exeggutor.
Hope this helps!