you have to trade it back and forth with another trainer to evolve it
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Dunsparce does not evolve.
Haunter doesn't evolve at any level to evolve your haunter you need to do a link trade with a friend and he he will then evolve
He evolves at lv.21 he evolves at lv.21in every other game too after gastly evolves into haunter trade him to make him evolve into gengar.
You evolve it into Haunter at Level 25. To evolve Haunter into a Gengar, you need to trade it.
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.