From the World Map (unless noted otherwise), select a level so you are on the "Start? Yes / No" message. Hold L & R and input the following codes:
A = Triangle
T = Triangle
O = Circle
C = Circle
S = Square
X = X
L = Left on d-pad
R = Right on d-pad
U = Up on d-pad
D = Down on d-pad

On Loco Editor Menu: LOTSOLOCOROCOS Adds 5 locorocos of each color to your Loco House.
On Loco Editor Menu: RADCATLOCOROCO Adds special part editing
STARSLOCOROCO Gives you 10,000 coins
ALLCOLORSLOCOROCO Gives you all the Muimui
On Loco Editor Menu: ALLLOCOROCOS Gives you all the parts
On Loco Editor Menu: ATTACLOCOROCOS Lets you use the 12 Special Loco Editor parts in Loco House (like the "toge")
SLACRLOCOROCO Open all stages
On Loco Editor Menu: SCALUDLOCOROCO Turns on scaling.