Not everyone agrees on the best Rotom form, however, the most used form is Rotom-H. The second most used form is the Rotom-W.
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fist you need to have a rotom then get the secret key
Rotom changes form by interacting with various appliances in the warehouse in Eterna City & Silph Co.
The only way to change forms is to have the Secret Key. Sorry!
You need a rotom then you can get to the next floor where you can change rotoms form and to get rotom you have to trade from diamond pearl platinum
You cannot catch Rotom in HeartGold or SoulSiver, you must trade it from a Diamond, Pearl or Platinum game. PS. If you put Rotom at the front of your party, you can go to the basement of Silph Co in Saffron City. If you examine the items, Rotom will change form.