try using a secret key which you can get with action replay
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No you do not have to use a cheating device such as an Action Replay or a GameShark in order to change Rotom into any of his other forms in Pokemon SoulSilver since there is a way to change it into its various forms in SoulSilver, you will need to place Rotom as your lead Pokemon and then you will need to operate the elevator that can be found in Silph Co. of which can be found in Saffron City in the Kanto region and when the elevator stops you can find the appliances that will allow Rotom to change into Fan Rotom, Frost Rotom, Mow Rotom, Heat Rotom or Wash Rotom.
Rotom can change forms in platinum
Rotom can't evolve, but it can change forms. Is this what you mean?
Rotom is an Electric/Ghost-type Pokemon that is #479 in the National Pokedex. It has the ability to change in multiple forms - Heat Rotom, Wash Rotom, Frost Rotom, Fan Rotom, and Mow Rotom - that all have different secondary typing in addition to Electric.
Rotom has 6 different forms:Normal Rotom - Electric-GhostHeat Rotom(Microwave Oven) - Fire-GhostWash Rotom(Washing Machine) - Water-GhostFrost Rotom(Refrigerator) - Ice-GhostFan Rotom(Fan, Duh) - Flying-GhostMow Rotom(Lawn Mower) - Grass-Ghost