let a porygon 2 hold a Dubious Disk, the same way you gave porygon 1 a upgrade to evolve it, and then trade it
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train it
evolves porygon into porygon2
If you give it to a porygon an trade it to get a polygon 2
Dunsparce does not evolve.
You can't evolve magneton in soul silver. You can only evolve it by trading it back to Diamond or Pearl and training it at Mt. Coronet.