I guess you'll never find those underground "gems." I was hoping to find a fake (fan made) copy of Harry Potter and the Deadly Hallows, but alas, it's IMPOSSIBLE!
I read that this particular version of Harry Potter and the Deadly Hallows was released before the actual legitimate version. Its title was "Harry Potter and the Wolf Totem" (a rough translation, Google that won't help). According to fans and casual readers (few intellectuals too), the fake book was better than the actual one. The readers said that if you had read this version of Harry Potter's final book, you probably don't want to read the real one, it was that good. The publisher had to destroy the book, because of obvious reasons...
Anyway, i'm not sure how good the fake Pokemon games are, but if you're a fan, i guess that's a good enough reason. This goes to the knock-off collectible community as well.