You cannot get a wild Jirachi except through the use of a cheating device.
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Jirachi cannot be caught in the wild. You'll need to migrate it from the Generation III games, trade for it, or use an Action Replay.
I think manaphy is storger then jirachi because it can bond with jirachi
Jirachi is unobtainable through special place and in the wild. The Mystery Gift event was held at 2010, it also opened up Night's Edge Pokewalker route. But now it is available when you have it in the older games and migrate it to Pokemon Heart Gold.
No, you cannot get Jirachi in Pokemon platinum.
You can't catch Jirachi.