Its body is composed of plasma. It is known to infiltrate electronic devices and wreak havoc.
Its electric-like body can enter some kinds of machines and take control in order to make mischief.
Research continues on this Pokémon, which could be the power source of a unique motor.
One boy’s invention led to the development of many different machines that take advantage of Rotom’s unique capabilities.
With a body made of plasma, it can inhabit all sorts of machines. It loves to surprise others.
— Pokédex entries (via PokeAPI)