You can't. You can only get jirachi in ruby and sapphire. You would have to trade from ruby or sapphire.
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No, you cannot get Jirachi in Pokemon platinum.
I use Ho-oh arceus darkrai jirachi groudon and deoxys
Uxie, Mesprit, and Azelf are the 3 fairy-like Pokemon from Pokemon: Diamond and Pearl. Celebi is the forest fairy Mew is a fairy And Jirachi is the wishing fairy.
go to super cheats.com mouse over Nintendo ds click then Pokemon d/p and action replay codes and you can get the jirachi fossil and go to the mining museum and theres your jirachi. TAH DAH thx man it worked perfectly but don't forget to have an empty place in party.
You can't catch Jirachi.