you first need to go to canalave city and talk to the sail boat guy and hes says do you want to go to iron island and he says do you want to go to full moon island (and you need to beat the Pokemon league) 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
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 can't catch Murkrow in Pearl. Murkrow is a Diamond-only Pokemon. Just like Misdreavus is a Pearl-only Pokemon.
You can catch Palkia in Pearl and tranfer Dialga to pearl from diamond.
You can catch Arceus in Diamond, Pearl, or Platinum.