In the mansion the marowak switches are on levels 2,and 3.(you are pobaly gonna get attacted along the way.)
you just have to switch the switches.
Your have to hit the Pokemon statue switches
you pull the switches and fall through the holes and ta da
you have to work your way through the Pokemon mansion and go out the right door while using the correct switches its and the very end of the Pokemon mansion
You have to go to the Pokemon mansion, This mansion is located in thee same town as the 7th gym leader. In the Pokemon mansion there will be many ways to walkthrough. (Hint, The mewtwo statues have switches.)
Marowak does not evolve.
Marowak doesn't evolve into anyone. Maybe you are confused with Cubone who evolves into Marowak
Marowak is #105 in the national pokedex, and it is a Ground type Pokemon.
Find the marowak statue and check it you should find a secret switch press it then the closed passages will open but remember the ones that were open may close!
NO!
You have to go to the second last floor. There will be a Pokemon's ghost guarding the stairs to the last floor. You will have to battle it and make it loose. It will only calm down and go away if she looses (If you have a silphscope the Pokemon will be revealed)( The ghost is a mother Marowak)
there is no Pokemon Mansion in Heartgold.