it needs to be around midnight for rotom to come out, just press A by the T.V.
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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.
Rotom is in the Old Chateu (the mansion/house in eterna forest)It is in the TV at NightI'm not sure if you need the national dex but when you beat the game spring path opens on route 214.
The upstairs is not in the game. You have to have Rotom in the lead of your party when you enter the building get rotom from Pokemon diamond and pearl at night in the haunted house he's in a TV. You have to have a rotom as the lead Pokemon in your party. Then, you go the the broken elevator, then press "A" on it, and then you'll have access to the 5th floor of the Silph Co. P.S. To get rotom, you'll need to trade from Pokemon Diamond, Pearl, or Platinum. If you don't have a rotom, go to the old chateau, then go into a room with a T.V. and press "a" on it, rotom will appear at lv. 15. You can only find him during the night time at 8:00 pm. The room you go to lets you transform rotom. When you go to the 5th floor there is rotom's secret room.
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
tap the tv at night. it will get rotom out.