Magneton doesn't have to be at a certain level to evolve, just level it up in mt. coronet.
it cannot evolve in heartgold, you must trade it into diamond, platinum or pearl then train it in mt. coronet
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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.
It evolves to Magneton at level 30. Then, you can evolve Magneton into Magnezone by leveling it up in Chargestone Cave.