you can catch them at the spear pillar i think after you beat the pokemon league or get the national dex. ther will first be a blue diamond. go in front of it and it will ask you if you want to battle dialga. choose yes and capture. then when you are done go into mount coronet's door from the spear pillar and go back to the spear pillar and you find a pink diamond and it will ask to battle palkia. choose yes and capture. hope this helped.
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NO!!!!! YOU CAN ONLY CATCH PALKIA ON PEARL you can't catch dialga on Pokemon pearl but you CAN trade it you only get both in Pokemon platinum
You cant but get Pokemon platinum you can get both dialga and palkia
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IN spear pillar on Pokemon platinum In diamond u can only catch Dialga and in Pearl u can only catch Palkia! hope i helped
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.