Yes you can come back and catch it but it will go back to full health. But if you KO it disappears forever unless you restart the game. (I wouldn't!) hope this helped!
Go to team galactic headquarters in veilstone. Then you talk to a galactic mem out side of the HQ he runs away and drops a key. Go inside the 3rd door to your right try to find a second key. After you find the second key get inside the 3rd door to your left find Cyrus or what ever his name is beat him and he tells you where Mesprit is (inside HQ) you WILL NOT be able to catch it. Bring potions, revives etc. glad to help :-)
Virus
catch all the legendaries. when u done that catch all the Pokemon in national dex. when u done that...... get platinum.
you can catch registeel even before battling the elite four. i would suggest before because he can become a great Pokemon in your team same goes for regice and regirock. hope i helped
Yes, if u can catch them in stock. I bought one today:)
Not in Pearl and Diamond. In Platinum you can.
You cannot catch them. However, you can still receive one in a trade - through a friend or over the WFC
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, but you have to defeat the Elite Four and the Champion again first.
yes uxie comes back to life after a while.
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.