Old cateau the tv at night
the old chateua inside the tv there is a rotom
you have to check the tv from 6 - 8 pm
if it is platinum go to the old chateu in eterna forest and it will be in a tv
and?
Go to the Old TV in the Old Chateu between 8pm and 4am. Rotom should come out of the TV and battle you.
Rotom is the Sinnoh (platinum) region #152, obtainable in the Old Chateau at night (by interacting with the tv in one of the rooms)
go to the tv in the old chateu at night ant you will find rotom
go to the old gatueau and go to the tv he is also a event you can get diffrent forms
To encounter Rotom in Pokemon Platinum, check the TV in the Old Chateau at night.
Go back at night and watch the TV
152: rotom (platinum pokedex) 152:chickorita (national pokedex) you can catch rotom when you examine the tv in old chateau between 8pm and 3:59am