Just level it up between lvl 25-30 for Metang and lvl 40-45 for Metagross.You can use an experience share.
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Beldum evolves at level 54 to Metang and level 55 to Metagross.^This is incorrect.Beldum evolves at level 20 into Metang. Then it will evolve at level 45 into Metagross.
Steven Stone will trade you a beldum in return for a Forretress (you need to evolve Pineco upto level 31) at the Silph co building, once you talk to him in the pewter city science museum)
beldum evolves into metang at level 20
Beldum evolves at level 36.
Level 35.