This only works on freeplay
Folow these steps as seen:

1) First, create a family with a child and move them in any house
2) Then move them out and edit the family by changing the child into a adult
3) Move them back into a house
4) buy lots of skill objects and max all the skills (if need more money press R1,L2,RIGHT,SQUARE,L3 and a cheat gnome will appear outside your house)
5) Once you've maxed all skills save and move out the family again
6) Change the adult with all skills back into a child
7) Now you should have a child with all skills so ENJOY :)

This is the correct gnome code:

Enter the following code during game

L1 R2 left square L3

This will cause a gnome to appear on the sims house bringing free $$$!!!!

OUTSIDER ART:
The outsider art goal is where you must visit to studio 8 and paint a picture of something.the easel is by the book shelf in the kitchen.

STOLEN FERN:
The stolen fern goal at the goth mannor is where you must visit Dudley's trailer and steal the fern in the back by the old car.

CONTAMINATED SPORES:
The contaminated spores goal is where you visit the goths and steal one of thier ferns.

SCI-FI MOVIE SCRIPT:
The tinsel bluffs goal, in order to complete this goal you must first unlock the shiney things lab and steal the brains thoughts.your dude or dudette will say how dumb the brain is for telling you it.

ANTI WAR PROTESTORS:
Visit club rubb and attack bing or monna. I sugest the one your not friends with.

ELIMINATE SENATOR LANDGRABB:
Invite malkcom over and trap him in a fence he will uventually give up and give you $5,000.

INFO GATHERING:
Visit shiney lab and steal the computer in the entrance hall.

MALCOMES MOVIE:
You must first become his friend then invite him to a party and have food and someone play the guitar well. Ask for the role and get $5,000.

It is fairly easy. You must have beaten all seven careers and beat everything at Malcolm's mansion!!!! Get 8 friends then make your relationship points -100!!!! Now you get that thing malcolm used to steal stuff!!!!!If your kid is a girl your kid will stay with mimi and be her age and if your kid is a boy then he will stay with dudley. The game will change and lave you six years in the future=>! Your mom also dies . Also you get the social "give wedgie".

Pause the game any time and enter these codes.
All skins L1,R2,X,O,UP,DOWN.
All objects L2,R2,UP,TRIANGLE,L3. L3 is the left joy stik.
All Locations R2,R2,L3,L2,R1,L1.
Money L1,R3,Right,square,L3.

Don't worry I tride these cheat codes

Ok first if you havent started the game yet, start by not customizing your sim for you don't use this one.Then get to your moms house and tear it down.Get
Rid of every thing by selling it, objects, floors, walls w/ wall paper, ect.
now you should have alot of money.Oh!!!Some items can't be sold because either someone is interacting with it or you just plain can't sell it!anyway save and exit then start a new file on either a second memory card or on the same one, BUT don't delete or overwrite the other save.start a new game this time customizing your sim, go to your moms. Press start on the second port controller, player two will come and the screen will split in half vertically(which is wierd!?!)there should be briefcase. 2 player must empty his money from the case.2 player must then press start and exit, save after that,and delete the 2 players file and start over from the beginning with a new 2 player file and not the customized file.repeat for big $$$.SO SORRY THAT IT IS SO LONG {:(

Pause the game, then enter the following codes. You must enter the Enable Cheats code first. After entering another code, select the gnome to access it.

Enable cheats- Press R2, L1, R1, L2, Left, Circle. A gnome appears in your yard when entered correctly.

Fill all motives- Press L2, R1, Left, Circle, Up.

Give Money- Press L1, R2, Right, Square, L3. Select the gnome to give money.

Unlock all locations- Press R2, R3, L3, L2, R1, L1.

Unlock all objects- Press L2, R2, Up, Triangle, L3.

Unlock all skins- Press L1, R2, X, Circle, Up, Down.

Unlock all social options- Press L1, R1, Down, X, L3, R3.

Happy gaming =) Superstyle4

Pause the game, then enter L2, R2, up, triangle, L3.

If you are in need in a little bit of help then follow these instructions.
During game play stand next to the mail box and press R2, L1, R1, L2, LEFT BUTTON then O, then a gnome will appear. Now enter the following codes:
Fill motives meter, L2, R1, LEFT, O, UP
All locations, R2, R3, L3, L2, R1, L1
All objects, L2, R2, UP, TRIANGLE, L3
All social options, L1, R1, DOWN, X, L3, R3

HAPPY CHEATING
(ALSO HAVE A GOOD SIMS LIFE!!)

I am so sorry, my last submission was wrong by 2 cheats
The cheats were blue knome and raise motives

Blue knome
R2,L1, R1 L2, left, O, Square

Raise motives
L2,R1, Left, O, Up

Well this cheat is actually for n-gage and it is if you want free furni. When your placing down an object wait until your one of your hunger or somthing to be low when he moans place the object down and then go out-side then walk back in, pick up the object then walk out-side again. Then you have doubled the oject.

To begin cheating pause the game and enter (as fast as you can)
R2, L1, R1, L2, left, O. You will hear a female voice saying ohh.

Then unpause the game and a gnome will appear somewhere at the front of your house near the road.

To use the fill motives cheat repause the game and enter (as fast as you can) L2, R1, left, O, up. You will hear the same ohh sound as before.

To use the unlock all objects cheat, unpause the game and enter
(as fast as you can) L2, R2, up, triangle, L3 (left analogue stick)
You will hear the same ohh sound as before.

Pause then enter:r2 L1 r1 L2 left circle
theres a gnome by your mail box,

Then enter:
L1 L2 right square L3 =10,000

Enter "R2 L1 R1 L2 LEFT CIRCLE" really fast then a female sim should say "ohhh" then a gnome will appear near the road.

Enter "L1 R1 DOWN X L3 R3" then the gnome will give all social options..!

:-)

Notice:
Cheats are entered at the title screen and you must enter them within 1.5 seconds.

Unlock ALL Locations:
R2 R3 L3 L2 R1 L1

Unlock ALL Objects:
L2 R2 Up L3

Gnome by your mailbox:
R2 L1 R1 L2 Left Circle