Once again, thanks goes out to Starry Might for giving us the heads up on this.
Diamond, Pearl, and Platinum owners in the U.S. will be able to pick up a Jirachi at participating GameStop locations from tomorrow, February 27, to March 13, the day before the release of HeartGold and SoulSilver.
Jirachi, of course is not available through normal gameplay in any Pokémon game. This one is extra special as it will have the normally dragon-exclusive move Draco Meteor and will unlock the Edge of the Night Sky course for the Pokéwalker. Jirachi's other moves are Wish, Confusion, and Rest.