In the Old Chatuea in Eterna City. Go to the middle room upstaairs and then go to the room with a TV. Rotom is in the TV
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You cnnot catch it in Pokemon fire red ,but you can catch it in Pokemon Diamond and Pearl.If you want it to be in your fire red,you will have to migrate it from your Diamond/pearl to your fire red.
Actually, you can only get Rotom by trading in Diamond, Pearl, or Platinum at Toys R Us.
In Pokemon Diamond and Pearl and Platinum which are the newest versions on the DS until the newer ones you catch Rotom after you get the national pokedex. Then you can transform him into different types.
Dialga, Giratina, Heatran, Mespirit, Uxie, Azelf, Regigigas, Rotom, Cresselia,
Rotom wasn't created until Generation IV, so you can't; the closest would be Missingno. The only versions on which you can capture Rotom are Diamond, Pearl, and Platinum.