You cannot make ghosts on Sims 2 at all, not even on the expansion pack 'pets'.
However, once a sim dies, if you move their ashes outside (they will become a tombstone) sometimes at night the ghost will appear and haunt the grounds surrounding the house.
If you then bring up the cheats box (ctr + shift + c) and type in: 'boolprop testingcheatsenabled true' without the quotes, shift click on your ghost and options should appear. You should come across an option that says 'Make Selectable' in capital letters. Then, you can see the ghosts needs and wants and fears (they will have frozen since your sim died) although you can't control it.
With a living sim, the closest you can get is by doing the boolprop thing I mentioned before and then shift clicking on the staircase in your house. If you then click the option that says 'walk...' there should be a choic that says 'like ghost'. the sim that is active will then float like a ghost!!! However this cheat does tend to kill your sim and a message may appear saying '[sims name] died on another lot' so attempt at your own risk!!!
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No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.
no you can only get pets on sims 2 pets.
I dont have sims pets (I have the sims 2 and seasons) but it's really easy to. go into buy mode and delete the grave! But if you want to keep it and dont want the ghost to come either keep your sims doing stuff so the ghost cant scare them or you can lead dem into a room and delete the door. The ghosts cant go thrugh apperantley. Then wait till daytime and the ghost will be gone.
if you have The Sims 2 and The sims 2 pets, install the sims 2 first and yes you need all four discs and the game case with the code. Then you can install the sims 2 pets and you will also need the manual for the Sims 2 pets or the game case for the code to install the game.
on the sims 2 pets on gamecube how do you do two players