You must defeat the Elite Four and Steven first. Once you've done this, fly to Mosdeep City, then go into the house towards the north-west of the city that has no people in it. There should be a Pokeball there and a note from Steven saying that he left the Pokemon inside for you, which is a level 5 Beldum. At level 20 it evolves into Metang, and then at level 45 Metang evolves into Metagross.
After beating the Elite Four, head to Steven's house in Mossdeep. In there, take the pokeball. The Pokeball will give you Beldum, which you will have to level up to Metagross
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that depends on the moves, the levels, and the natures.
Get Beldum in the Massoutbreak evovle @ level 20 and into Metagross @ level 45
whan u beat the elite 4 go to Stevens house and there will be a letter with a pokeball beside it take the pokeball and inside it will be beldum witch evolves into metang at lvl 20 and into metagross at lvl 45. recommended moves for metagross are meteor mash,earthqauke,pshycic and hyperbeam. hoped i helped p.s Pokemon ruby rocks
Metagross is a Steel/Psychic type, therefore it is weak to...GroundFire
Sometimes you can breed metagross, sometimes you can't, it depends on the Pokemon version, but if you breed it with a ditto, the metagross should be able to breed.