You cannot get a Jirachi in "Pokémon Diamond" except for through using the Colosseum Bonus Disc, downloading the Jirachi from that into either "Pokémon Ruby" or "Pokémon Sapphire" and then migrate it into Pokémon Diamond or you could have gotten a Draco Meteor Jirachi from the GameStop Jirachi event that was held in February and March of 2010, additionally you can use an Action Replay cheating device or a Pokésav in order to cheat a Jirachi into Diamond.
Go to game stop and have them down load it. bring ur dimond, pearl, platinum game with u and your ds or they cant do it. be fast though, its only through a limetted time!!! best of luck!!
beat the Pokemon league 100 times in a row ...don't listen to him. he just wants to waste u'r time. and 4 the answer...action replay (which i don't have)
Dimond and Pearl Dimond and Pearl Dimond and Pearl Dimond and Pearl
Jack Dimond's birth name is Jack Harry Dimond.
Tony Dimond's birth name is Anthony Paul Dimond.
who killed charlotte Dimond
Clark Dimond was born in 1941.
Mathew Dimond was born in 1975.
Anthony Dimond was born in 1881.
Anthony Dimond died in 1953.
Dimond Center was created in 1977.
jirachi is not in sapphire