You have to have arceus first in your team. Go to the ruins beside city and Cynthia should talk to you about arceus. You can now go into one of the rooms that was locked before. You will see an event to do with arceus and Cynthia and three pokeballs will appear. In them are palkia dialga and giratina. You can only choose one. You have to have an empty slot in your party for this to happen in the first place though.
If you have an arceus then you can go to the ruins and trigger this trippy event where you see the world forming and stuff and then it gives you the option of taking a lvl 1 dialga, palkia or giratina
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no
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
You cant, you have to trade him from a Pokemon Diamond game.
its is dialga
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