Easy if u dont catch DIALGA and you kill it, it will say dialga vanish or soming
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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
You catch dialga/palkia on spear pillar inside of Mt. Coronet for diamond or pearl
You can catch Palkia in Pearl and tranfer Dialga to pearl from diamond.
You can't catch Dialga in Pokemon White. After you beat the the Elite 4, you can use the PokeTransfer to receive a Dialga from Pokemon Diamond, or Platnium.