You cannot catch Dialga after defeating it. If you defeat it the first time you battle it, then it is all over. You cannot catch him.
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Easy if u dont catch DIALGA and you kill it, it will say dialga vanish or soming
you cannot catch prime Dialga, only normal Dialga!
You catch dialga/palkia on spear pillar inside of Mt. Coronet for diamond or pearl
yes
You can catch Palkia in Pearl and tranfer Dialga to pearl from diamond.