it is very hard to get azelf and mesprit and uxie. in my Pokemon diamond, azelf and mesprit fled the battle. if you want to find them, use your matching Pokemon app on your watch and DO NOT FLY UNDER ANY CONDITIONS. IF YOU FLY, THE POKEMON WILL ALSO FLY AND YOU WILL NEVER FIND THEM. DO NOT LOSE HOPE!!
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No, Azelf will never come back. If you haven't saved yet though, you can turn off and on and Azelf will be there. What!? what about Uxie? i accidently defeated them, as well as Dialga!
Yes, Azelf will respawn, if you have fled or accidentally faint it, after defeating the Pokemon League.
NO it doesn't
you have to come back later, i think it is after you have finished the game.
you cant unless u tade but someone else says if you defeat the elite four they come back even if u defeat them i dont know if its true or not hope it helped