As someone who is working on a similair "non"fiction in a fictional worlds book (I'm doing more of an overall book about the entire universe, history and science all cobbled together over 600 years) I find this absolutely amazing.
I seriously feel like I could have walked into the pokemon equivilant of Barnes and Noble and picked this up in the non-fiction section. It also very much reminds me of Magical Beasts and Where to Find Them by Rowling, but for pokemon and that is just amazing.