No, you can't. To get it, you must trade from any of diamond, pearl, or platinum.
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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
If by "shamin" you mean "Shaymin", then you can't. It must be traded from Pokémon Diamond, Pearl, or Platinum.
platinum only
You'll need to trade from Pokemon Diamond, Pearl, or Platinum.
no you have to trade it from diamond,pearl or platinum.or you can receive mystery gift
you cannot get shaymin in soulsilver unless you trade from Diamond,pearl or platinum
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
you can get it 3 ways 1 trade 2 hack 3 get the event
You cannot catch palkia in diamond and dialga in pearl but you can catch both of them in Pokemon platinum
In a way. In pearl, you catch palkia. And in diamond, you catch dialga.