Here's a breakdown of Rotom's forms in Diamond:
* Normal Rotom: A swirling mass of purple and yellow energy with two small, round eyes.
* Rotom Wash (Washing Machine): Rotom appears inside a white washing machine with a blue lid.
* Rotom Heat (Microwave): Rotom is inside a red microwave with a silver door.
* Rotom Frost (Refrigerator): Rotom is inside a white refrigerator with a silver door.
* Rotom Fan (Fan): Rotom is inside a white fan with three silver blades.
* Rotom Mow (Lawnmower): Rotom is inside a green lawnmower with a silver blade.
Note: Rotom's appearance is not limited to the appliance forms, and it can appear in its original form outside of the appliances as well.
Keep in mind that while Rotom has multiple forms in Diamond, you can only encounter and catch the original form of Rotom. The other forms are acquired through specific interactions with Rotom after you catch it.