I don't think you can. You'll either have to trade with another game or maybe use a cheat. However, Pokemon Platinum has a kirlia. Hope this helps..............
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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
Dawn stone on pearl/diamond/platinum
you cant get gardevoir but you can catch either ralts or kirlia and evolve it int gardevoir(ralts to kirlia to gardevoir to gallade
Catch a Kirlia in the North of route 212 and evolve it.
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