While on a lot in Live mode, press L, R, Up, X, R to spawn the Cheat Gnome. The Cheat Gnome appears at different locations, depending on which island you are on. Find the Cheat Gnome, then enter one of the following codes to unlock the corresponding option on the Cheat Gnome. To use the Cheat Gnome, approach it and press X.
CHEAT FUNCTION - CHEAT CODE All plans - X, R, X, R, X. All crafting resources - SQUARE, TRIANGLE, R, Down(2), Up. Maximum current food and resources - Quickly press SQUARE(4), L. Maximum inventory - Quickly press LEFT, RIGHT, SQUARE, R, SQUARE. Maximum relationships - Quickly press L, Up, R, LEFT, TRIANGLE. Full motives - Quickly press R, Up, X, SQUARE, L. Add skills - Quickly press TRIANGLE, L(2), LEFT, TRIANGLE.
Make an account that has their main skill as cooking and get their cooking skill up to level 6. Then get level 6 mechanical and enable the "Maximum current food and resources" and "All plans" codes. Next, make the metal stove. Cook something random and eat it. If it increased your skills, open the screen and select "Island Travel". Then travel to another part of the island. You should now have the raised skills permanently. Repeat this process to get 10 of every skill, so that you can build a bungalow, bathroom, shower, marimba, and a better bed.