For pokemon diamond i cant find where uxie and elzelf?

Question

i went to them about three days before saw them then ran, now 3 days later i tried to catch them and they are gone my friend did the same and he caute them

Answer 1

You saved after you ran? They are one time event pokemon. Once you run/catch/defeat your never going to see them again. You ought to of saved before trying to catch them and reset when you couldn't to try again.

Answer 2

if you went into a battle with them and ran then i don't think you can get them in the game again but if you just went into the cave without battling then you should be able to find them in the same place again

hope i helped =]  

Answer 3

the 2 lakes :)