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You cant do that in Pokemon pearl or diamond but you can in platinum!! From poke-know-it-all
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.
it doesim pretty sure it has to be somewhere around 12:00am( when small children are in bed)so all you have to do is change your DS's clock timePS that is what i didyou're welcome
Rotom does not evolve at all ,but in Pokemon platinum (which will come out in spring 2009)it has 6 forms. Original Form, Frost Form, Spin Form, Wash Form, Cut Form and Heat Form. i also heard it evolves into somthing called rotomore i do not know if this is true that is just what i was told
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.