Dunno what you mean by unlock, but here's how you get Rotom: go to the building near eterna city and forest, it has trees; you need Cut, go in. In 1 of the rooms there is a TV. Press A. Rotom is at lvl 15.
You unlock a place where Rotom can change its forms.
Yes you need to go to a special place to unlock them though.
Pokemon event
rotom
No trainer have Rotom in Pokemon Pearl, Diamond, or Platinum.
You cannot capture Rotom is HG or SS. The only way to get one and unlock the special room in Silph Co. is to trade from Diamond, Pearl, or Platinum.
No.
in the mansion that has gastly
To encounter Rotom in Pokemon Platinum, check the TV in the Old Chateau at night.
after rotom you should have beaten the gameYou have to trade rotom from Pokemon diamond or gold.you dont you trade it from platinum diamond or peralYou cannot catch Rotom in SoulSilver. You need to trade from Diamond, Pearl or Platinum.
Rotom.
The 152 Pokemon in the Pokedex is Rotom, not the other Rotom's just electric Rotom