I fled the battle because I ran out of pokeballs. Will Uxie return or can it be found roaming around Sinnoh. It isn't appearing on the map.
Yes he will return if you flee I did the same thing with azelf. But if you kill a legendary they will never come back.
No speed freak your not right if you kill or flee all you have to do is beat the elite 4 again and it will come back