The easiest way to get Dialga on soul silver is to trade it for diamond/pearl/platinum.
But I have Heard of an event in which you can choose one of the three (Dialga/Palkia?giratina) using an event Arceus from diamond/pearl/platinum, but have not tested it.
From what I have heard, if you trade a legitimet mystery gift/event arceus, it is supposed to unlock an event on heart gold/soul silver and you can choose one of the three mention earlier. But the easiest way is to just trade a dialga from diamond/pearl/platinum
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You cant, you have to trade him from a Pokemon Diamond game.
In Pokemon Diamond, Pearl, and Platinum, you cannot 'recatch' Dialga, but you can have multiple attempts if you save before battling Dialga. In Pokemon HeartGold and SoulSilver, when you do the Arceus event, you automatically obtain your choice of Dialga, Palkia, or Giratina.
In Pokémon Pearl, you can only obtain Dialga by trading it from Diamond, Platinum, HeartGold or SoulSilver.
You can't because it wasn't invented when that game was made. You can only get it on Pokemon diamond, platinum, and heartgold and soulsilver if you got the arceus event from DPPt. There is no way to get a 4th Generation Pokemon in a 3rd Generation Pokemon Game.you cant catch Dialga he wasn't created back then