u cant...u hav to go to Stevens house in mossdeep (with an empty slot in ur party) after u beet the elite 4 and there will be a pokeball in the desk....take it and it will be a beldum
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As of Generation Four, and Probably Generation 5, there is only one Beldum. In Ruby, Sapphire, or Emerald, after beating the champion, go to Steven Stone's house on Mossdeep City, and he has left a pokeball and a note, saying that he has given you Beldum to keep. So, you CAN catch Beldum in an Ultra Ball, but there are no wild Beldum TO catch in an Ultra Ball.
You get Beldum for free, from Steven after you finish the Pokemon League, go to Stevens house and the ball will be on the table.
Beldum evolves at level 36.
you can catch beldum at route 228 with poke'radar
After you beat the League and go to steven's house and there is a pokeball on the table.It has a beldum inside it.