(This is a crossover between MLP:EG and the fangame Pokemon Insurgence, with the story following the dark storyline of the game. This essentially means that other than a few acts of violence and a couple of non major deaths, the only big thing is that the evil teams are cults.)
As strange occurrences begin happening around CHS that Sunset and the others can't seem to figure out, Sunset hopes that a visit with Twilight will help clear her head and yield some answers. However, things go awry as the portal to and from Equestria is corrupted by a shadowy entity that drags Sunset through the portal and into a world that while similar, is entirely different than that of the human version of Equestria. As Sunset travels through what is known as the Torren region with a boy who has lost his memories alongside strange creatures known as Pokemon, the two of them must fight cults who wish to use the power of the legendary Pokemon they worship in hopes of ruling over the region, all the while uncovering the dark secrets the region keeps hidden in hopes of finding a way for Sunset to get back to CHS.