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Gamecube - Cubix Robots for Everyone: Showdown cheats

Go to "Extras" from the main menu and go to the "cheats" screen and
Press the following button combination:

Get Dr. K's Base & Robots
Press Z, A, Y, Y, Y, X, A.

Get Bubble & Town & Night & Robots
Press Y, L, Y, Y, X, L, Z.

Get Game Finished as Abbey
Press X, R, X, Y, X, Y, R, L.

Get game Finished as Conner
Press X, Y, L, Y, X, Y, L, R.

Get Construction & Robots
Press Y, Y, Y, Y, Z, A, R.

Get Bubble & Town & Day & Robots 
Press Y, Y, Z, Y, Y, R, L.