How to catch uxie

Answer from: trainer of spac
If my memory is correct go to lake valor when you have caught dialga or palkia

Answer from: trainer of all
Secret: you can catch palkia in diamond if you ave caught mespirit, azelf uxie by talking to the old man in the town where you see marks after seing cynthia there you will need to have dialga the man will give the loustrous orb return to spear pillar.

Answer from: Creambelle
Uxie is in spear pillar (hint : save before battling and dont beat it cause if you do it will forever disappear and if you accidentally beat it, reset your ds and try and battle and catch it this time )

Answer from: poke master
Save him at the spear pillar then go to the man who gives you poke apps get the map use the map a pitcher would be on the map go there uxie will be there

Answer from: Super Girl
After battling or catching dialga or palkia go to lake valor and go inside the cavern and you will see uxie.

Answer from: Wem
To get Uxie, first do the event at spear pillar (spoiler: must defeat Cyrus etc.) After that, go to one of the lakes (the one at snowpoint city) with a pokemon who knows surf and sail to the center. Go into the cave at the center of the lake, enter it, and inside is Uxie. Walk up to him and press a, and begin the battle.