Rotom can't evolve, but it can change forms. Is this what you mean?
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The only way to change forms is to have the Secret Key. Sorry!
fist you need to have a rotom then get the secret key
give him a secret key the different secret key the different rotom
the secret key is a thing to change the forms of rotom...... they are: fan rotom, wash rotom, heat rotom, mow rotom, and frost rotom. the secret key opens a secret room in enternal city where you can change rotom's forms. The Secret key is avalible only on via Nintendo Wi-Fi Conncetion April 20th Thru May 12th (thats my B-day!, may 12th). it is avalible at Toys R Us Locations in the U.S, Canada, and puerto Rico. Hope it Helped :) !!!It did 8D!!!
you don't need either but its easier to have rotom so you can get the rotom forms faster.