Smeargles that have the shiny sprite (red tipped tails) in XD aren't really shiny sprites. If you get a Smeargle with a red tipped tail in XD and transferred it to one of Gen 3 games, it would have a green tipped tail, a normal one. Gamefreak probably put the shiny Smeargle sprite to make it more interesting. A shiny Smeargle in XD has a dark green tipped tail instead of the red tipped ones.
