You could use quick balls for the first 5 turns, attack to wear it down to the lowest possible and then dusk balls until the battle has gone on for over 40 turns, then use a timer balls until you catch it or run out of balls. Or you could cheat using a masterball from an Action Replay, GameShark, or the one you get in the game. Easy.
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dialga bring about fifty or more pokeballs weaken it till it's hp is yellow/red but DON'T DEFEAT IT!!!!, p.s you find dialga at spear piller when you defeat Cyrus, trainer's note. you can only catch dialga on diamond. you can only catch palkia on pearl. you can catch dialga palkia/AND GARITINA!, i have platinum and caught all of then so i know post a question about how to get garitina on Pokemon DIAMOND! Actually in Diamond and Pearl u just need the Master Ball that Cyrus Gave you beforehand!
THE POKEMON THAT ARE NOT FOUND IN DIAMOND AND PEARL ARE:MANAPHY PHIONE
diamond
You can get Palkia in Pearl, otherwise you have to transfer Palkia from Pokemon Pearl to Pokemon Diamond.
some of the Pokemon are different such as diamond has dialga and pearl has palkia some of the Pokemon are different such as diamond has dialga and pearl has palkia