use a ghost type Pokemon with scary face so it cant run away and then use a dusk ball or a net ball and you will get it
don't fly or it will run away
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you need azelf,uxie,mesprit to open the cave after beating the Pokemon league
You can't, you will need to trade them from Pokemon Diamond, Pearl or Platinum.
Throw Safari Balls at it.
you can go back and catch: -azelf -Uxie -Mesprit and also a SECOND -Palkia and a SECOND -Dialga
You get the app from the president of the Poketch company in Jubilife City after winning the Veilstone City Gym battle. In Pearl, this app is used for tracking Mesprit and Cresselia