PokéBase - Pokémon Q&A
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I can get it's original forme but I don't know how to change it.

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2 Answers

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>Starting in Platinum, Rotom also has five extra forms (each based on a household appliance), which can be accessed by possessing specific appliances.

Source: Bulbapedia/ Rotom
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You can't change his forms in Diamond because he does not have any yet.

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OK Thanks
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Rotom does not have any forms in diamond except the standard one, the other ones are from pokemon platinum you need pokemon platinum version in order to change the form

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why did you answer if i already did??
You should answer a different one...