My Japanese Pearl was blessed or something since it gave me a shiny Staraptor, Gastrodon, and Mothim all on its own. From other games I did get a shiny Gyarados (Emerald) and Tentacruel (Leaf Green), though, but having so many from one game... Just odd stuff.
On the other hand, the Staraptor, Gastrodon, and Mothim have rather lame natures and/or stats, whereas my Gyarados came out during IV breeding and is pretty good (though not the best) and my Tentacruel was caught as a wild Tentacool yet still managed to get a Speed+ nature and a 31 Speed IV.