No, you cannot get Jirachi in Pokemon platinum.
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Nope you're screwed dude. Sorry!
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 use Ho-oh arceus darkrai jirachi groudon and deoxys
You can't catch Jirachi.
Jirachi learns Trick by 1 of the Move Tutors in Pokémon Platinum, HeartGold or SoulSilver teaching it to it (Jirachi.)