any time after catching not receiving from a trade `Catching` dialga or palkia.
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sadly, once you knock it out, it doesnt come back
You go to the Spear Pillar in the top of mount. Coronet and either catch or defeat Dialga in diamond and palkia in pearl then when you go back the water will be back PS. I suggest you catch Dialga/Palkia Maybe use a master ballwell 2 be honest i don't really know but it could be outside the place u catch girintina
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.
The only way to have a 100% catch rate is to use a Master Ball.
No, it is a one time only pokemon.