Yep. But you have to defeat the Elite Four and Cynthia first. Then you return to its cave.
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yes, but it takes a while, and use the poketech app that allows you to track Pokemon
the next day. make sure you have a master ball or 99 ultra balls.
you cant get it in emerald, its only in diamond, pearl, and platinum
They will run away, and you have to find them in the wild and capture them.
in platinum the different sprites are UXIE,MESPRIT and AZELF