You cannot catch them. However, you can still receive one in a trade - through a friend or over the WFC
In platinum it would be better not to kill mesprit uxie and azelf, it would be better to catch them.
you head over to the spear pillar and catch or kill dialga
you catch him in lake valor
you catch raikou on the last gym leader in the kanto leaders and you catch uxie in vermillion city from
yes uxie comes back to life after a while.
yes, but it takes a while, and use the poketech app that allows you to track Pokemon
Uxie is in Lake Acuity after you catch Palkia. Go to Lake Verity first, go into Mesprit's cave, and the Professor will talk to you and you will be able to catch Azelf and Uxie. ~Lucario
the way you catch azelf mesprit and uxie.
Lake acuity cave.
=no=
ultra ball
you can't find Uxie again if you have knocked out Uxie, unless u defeat the elite four again.