[Flamestrike]

From the DAT:

Rotom can be caught just like any other Pokemon; however, its appliance forms are more difficult to access. The arena must be a junkyard or some similar space where such appliances can be found, and then Rotom can possess those appliances. Once Rotom has an appliance form it may discard it at any time and move to another appliance (if it is available) or to no appliance. Phasing into or out of an appliance in battle takes up an action.