Well, you go to Saffron City and go into that Silph co. building, Steven will be there. if you talk to him he will ask you if you have a foretress. And he will trade you Beldum. to get Foretress you have to get your Pineco to lv.31, in doing so he will trade you a Beldum that will only know take down. The Beldum will be holding a dawn stone.
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Steven will never appear in the Ruins of Alph.
You have to have the Engnima stone.
Mt. Silver after you defeat Red (A.K.A. Ash) who is also somewhere in Mt. Silver
no
Steven Stone will give you a Beldum in exchange for a Forretress.