if you go into nine mall the in then storage room has boxes and you can press a on the box a pick which form :)
Chat with our AI personalities
fist you need to have a rotom then get the secret key
The only way to change forms is to have the Secret Key. Sorry!
You must have a rotom from Pokemon diamond/pearl/platinum and have it as the first Pokemon in you party. Then take it to the lift and rotom will let you use the lift. After the lift has stoped you should be able to change rotoms form
Rotom changes form by interacting with various appliances in the warehouse in Eterna City & Silph Co.
In order to change it's form you must receive the "rotom key" through a mystery gift or Action Replay. I got mine at an event at Toys'R Us. Then you must go int a secret room in the Team Galactic Eterna Building. Search for the secret room, and inside it there are appliances. If you have rotom in your party, you just walk up to an appliance, and press a. The rotom will change.