It's not perfect, but it's pretty close. Be sure to put it on your own webspace if you plan to use it online, because it'll be taken off of mine after a few days.
I think "official" is subjective. Nintendo, and specifically Sugimori, doesn't so Shiny art. That's just someone altering the color and light levels until it matches the shiny. Not that there's anything wrong with that - it's easy and effective - but it's not official since it didn't come from Nintendo's artists.