I’ve been reading this Harry Potter/Pokemon crossover lately, and it’s honestly one of the best crossovers I’ve ever read. It’s Harry Potter, but instead of magic, Hogwarts teaches students about training Pokemon and other various disciplines relating to Pokemon. Also, there is no Great Britain, it’s the region of Avalon with all the other Pokemon regions representing the rest of the world. 

My favorite thing about the series is that it takes nearly everything about the Harry Potter series and turns it on it’s head. It takes tons of liberties with the source material and makes it’s own twists on canon events (for instance, Harry is still famous as the Boy-Who-Lived, but Lily is the one who’s famous for defeating Voldemort as the Woman-Who-Won).