It is Pokemon platnium.
There is no Pokemon Mansion, it was destroyed by the Volcanic Eruption in Cinnabar.
On Cinnabar Island
The Pokemon Mansion is home to some rare Pokemon. To find it in Pokemon Pearl version, go to route 212.
no but in heartgold soulsilver you can if its in front of your party
Cinnibar Island
Cinnabar mansion
no you cant leave sinnoh in Pokemon platinum version trust me I've beaten the game 100% 2 times i think id know
There are various Pokémon available to capture inside the mansion in FireRed version. For example, there is Koffing and Grimer.
It depends. If it is your first, then lvl 36. If it's your second, like mine, then it's lvl 34
The Pokemon Mansion on Cinnibar Island, and after you beat the Elite Four, Mt. Ember of the Sevvii Islands.
It depends which version you are playing. Red/Blue version: You can find Koffing in the Pokemon Mansion, however he is rare in Blue version. Yellow Version: He cannot be found in Yellow. Gold/Crystal/Silver version: You can find him in Mahogany Town or the Burned Tower. Ruby/Sapphire/Emerald version: You can find him on the Fiery Path, however he is rare in Sapphire version. FireRed/LeafGreen version: You can find him in the Pokemon Mansion, however he is rare in LeafGreen. Colosseum: He cannot be found in Colosseum. XD: He cannot be found in XD.