Honestly Slyvain if you are super curious about it, and not just the new one wikipedia isn't too bad. And you can even read it in French if you want!
https://en.wikipedia.org/wiki/Pokémon
I read a bit about in on Wikipedia.Mosty about the controversies.
Still not sure if they can appear on private space, leading people to potential tresspas.
The app was criticized for using locations such as cemeteries and memorials as sites to catch Pokémon,[SUP][72][/SUP] including the Auschwitz-Birkenau State Museum,[SUP][73][/SUP] the United States Holocaust Memorial Museum,[SUP][74][/SUP] the National September 11 Memorial & Museum, and Arlington National Cemetery.[SUP][75][/SUP] The game sparked complaints from Dutch company ProRail, who said that players had entered their railway tracks,[SUP][76][/SUP] and fire stations told players to not impede their staff by congregating outside.[SUP][77][/SUP] The game's distribution of Pokéstops and gyms (derived from the portals of Ingress, a previous science fiction-themed Niantic augmented reality game) has been noted to be sparser in many minority neighborhoods in a reflection of American demographics.[SUP][78][/SUP] Residents of the Sydney suburb of Rhodes became fed up with large numbers of players gathering in their area,[SUP][79][/SUP] and threw waterbombs at visiting players.[SUP][80]
[/SUP]Some early iOS installs of Pokémon Go required users to provide the app with full access to theirGoogle accounts, thereby allowing the app to "access players' Gmail-based email, Google Drive-based files, photos and videos stored in Google Photos, and any other content within their Google accounts"