level 25. If you want it to evolve fast give it the exp. share (given by mr. stone after you give steven the letter) and fight the Elite 4 with your strongest Pokemon.
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beldum evolves into metang at level 20
Beldum evolves at level 36.
Level 35.
Evolve Beldum.
20 no its 25 mine is at 20 and didn't try to evolve