No he won't. The best thing to do when catching a legendary Pokemon is to save it before you battle it. That way if you don't catch it you can turn it off and try again.
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In Pokémon Diamond and Pearl, you only have one chance to capture Uxie. If Uxie faints or if you run away, then you will not get another chance to capture it. The answer is no.
No, once they're gone, they're gone....Sorry....If I were you, I would buy some new puffles....
You can not come back, trust me i tried But you can still find them and catch them in the grass if you use max repel and search the grass about 20-30 times. But make sure you have a lot of poke, great, or ultra balls.
The battle will end and the Ho-Oh will disappear. However, it will come back after you defeat the elite 4 again.
He is no where he ran away very far away he never comes back so you are outta luck.