To get Rotom you need the National Dex and it has to be night (after 8pm). Then go back to the TV and try again. It's at level 15 and hard to catch.
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In Diamond, pearl, and Platinum you go to the old chateou at night, talk to the TV say yes when they ask you if you want to thump the TV, then you battle rotom. He is level 15 in Diamond and Pearl, and level 20 in Platinum.
Well there is alot of Ghastly in there and Rotom. If you go there after you get the National Dex at night and thump the TV upstairs Rotom will come out. He is lvl 15 and is Ghost/Electric. Try not to kill it
The Pokemon Rotom can only be found at night, by entering the spooky mansion in Eterna Forest, going up the stairs, and then entering the middle door. Find the door that leads to the room with the TV, then walk up to it and press A. The game will tell you that there is a Pokemon hiding in the TV, and then it will ask you if you would like to thump it. Say yes and Rotom will appear.
tap the tv at night. it will get rotom out.
if you are wanting to know its easy its rotom