Because Pokemon Prism is a soon to be released rom-hack and I'm SO hyped for it! It's taken almost 8 years and I first found it over 6 years ago. It's being played on Twitch Plays Pokémon on the 9th (18:00 UTC) and releasing early December. (Would be earlier but some of the development team are worried if they release it too close to Sun and Moon it might get a cease and desist.)