How do you encounter dialga again?
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Dialga can be found on Spear Pillar. It can be found in the Blue Portal, if you have the Adamant Orb and the National Pokedex. The Adamant Orb can be found somewhere in Mt. Coronet. You can also trade for a Adamant Orb.
I believe you only have one chance at Dialga, so try not defeat it. If you do defeat it, you can still trade for one.
Hope this helps!
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