While it is not known to evolve into or from any other Pokémon, Rotom has the ability to possess the motors of certain appliances and change forms. It also learns a new move depending on which appliance it possesses.
When it does not possess an appliance, (or, in Generation VIII and Generation IX, is possessing a light bulb) it is dual-type Electric/Ghost and learns Thunder Shock if the move it had in its other forms is the only move it knows.
When it possesses a microwave oven, it becomes Heat Rotom, is dual-type Electric/Fire, and learns Overheat.
When it possesses a washing machine, it becomes Wash Rotom, is dual-type Electric/Water, and learns Hydro Pump.
When it possesses a refrigerator, it becomes Frost Rotom, is dual-type Electric/Ice, and learns Blizzard.
When it possesses an electric fan, it becomes Fan Rotom, is dual-type Electric/Flying, and learns Air Slash.
When it possesses a lawn mower, it becomes Mow Rotom, is dual-type Electric/Grass, and learns Leaf Storm.
