You have to trade it from Diamond and Pearl.
all you have to do is simply trade it to pokemon diamond,pearl or platinum but you need two ds's and two of the games i listed above.
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you can trade to diamond lv up in mt coronet
Sorry to tell you this, but you can't evolve magneton on any gameboy advance games only on Pokemon games that have come out after diamond and pearl(including diamond and pearl) have the Pokemon that evolves from magneton.
Did you mean Magneton or Magmar. If it is Magneton or Magmar you have to trade them.
Magnemite evolves into Magneton starting at level 30.
No, it evolves at Mount Coronet found in Sinnoh. Only in Pokemon diamond, pearl and platinum. Now you can also evolve it in Pokemon black and white. Level up a Magneton at Chargestone Cave and Magneton evolves.