Yes, go to pokemongoldsilver.com for information.WARNING! Dialga will be at level 1 if you get him.
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No, but you will be able to catch Palkia, Dialga or Giratina.
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 must have the event Arceus and go to the Ruins of Alph.There you will find Cynthia and she will give you Palkia,Dialga,or Giratina with their orbs at level 1.