Entry location: Make the Gnome appear first, then wander around until you find the gnome and enter the cheats.
Down, L, Z, R, X, Left - Makes Gnome Appear
Down, Z, Up, Y, R - Acquire Skill Object
B, Left, X, R, L, A - Get All Power Socials
B, Left, X, R, L - Get Power Socials
R, Y, Up, Z, Down - Max Artistic Skill
Down, X, Left, R, Down - Max Mental Skill
R, Z, Down, Y, Y - Max Physical Skill