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You can catch a Rotom at night by talking to the tv
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.
If you mean Rotom, heres a tip: go to Old Chateau (night time). There is a room with TV. Examine the TV, and you will fight Rotom. WARNING You have only one chance to catch him!
You need to go to Eterna Forest and catch one but it has to be at night. Hope I helped.
Catch chingling in Mt. Cornet. then evolve when happy at night