Hello my Nitelitez,
As I gradually upload more non-Pokemon-like images related to the BW3 folder I haven't really formally said what it's about but it hasn't really been a secret. So I think it's best to just lay it all out there.
Pokemon Black & White 3 focuses around the demonology and other mythology of Unova and along with Pokemon which are of course catchable, there are also demons which cannot be caught (Relix for example). Demons are essentially evil Pokemon that were trapped in the Distortion World (Hell) along with Giratina. And in the game the antagonist has gotten a hold of an item which can summon demons which is part of why he isn't technically a Pokemon trainer yet still makes an impact. And as the Distortion World is connected to all regions of the Pokemon world, it works in the story.
Demons for summoning do require human sacrifices so it will get a bit dark and a lot of NPCs will die in the game. Luckily there will be a way to combat the dark magic with some light