No, you can't. To get it, you must trade from any of diamond, pearl, or platinum.
You cannot catch shaymin on platinum without cheats unless u get the event xcard from toys r us
just trade it with me i have one from my friend
use an action replay
You can't get the Miracle Berry without the Shamin event.
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nope
If by "shamin" you mean "Shaymin", then you can't. It must be traded from Pokémon Diamond, Pearl, or Platinum.
http://www.serebii.net/platinum/battleroulette.shtml
you need oak's letter and then you have to go to route 224 in pok'mon diamond, or pearl. I am not sure about poke'mon platinum
Through an event or Action Replay codes
You go to Union Cave and it will appear