Yeah, anything I try, it doesn't work.
I put them in the red zone (energy) then put them asleep and try ultra ball (and some timer ball also), but no way I get them. The ball shake 1, 2 or sometimes 3 times (more often not at all). It's certainly not because I'm not patient, cause I throw about 25 balls and have made 3 tries (I restart my game cause I have killed the pokemon). I changed my first strategy a little bit, cause the first times, i was using my Abomasnow with his power of making snow each time he enters a battle. I was sure, this way, to have the pokemon with the lowest HP possible, but it always kill it before i could actually capture it.
So, how did you do? Do we absolutely need to use the master ball? (so to choose between Uxie, Azelf and Mesprit)
Oh, and is it normal that Mesprit flee when i go see it? Or is it just because i went before i battle the elite 4 ?
Thanks in advance.
Edit : Ok, finally, 35 ultra balls and 8 timer balls later, I got it (and 3 hyper potions, 1 revive and 1 berry - the one which gives pp back - too). I got Uxie. But if you found a better way, i'll take it on my way to Azelf (and i'm a little bit impatient cause seeing Azelf is the only think I need to have de national dex ^^). But if the only way is really to throw 40 balls then... i'll go bought 50 new ultra balls I try again with Azelf (and latter with Mesprit... oh, so much fun! XD)