Polar's Digimon Land

Start a new game and enter a name. After the FMV sequence ends, hold Triangle + Square + Circle. A menu should appear. Release the buttons and check your inventory to find all kinds of items. Feed your Digimon with something. If he shakes his head, quickly press Triangle + Square + Circle again. If he eats it, quickly press Triangle + Square + Circle again. Depending what was fed, he will turn into different kinds of monsters. If you are not satisfied with that monster, hold Triangle + Square + Circle immediately after the monster changes and feed him with something else. Release the buttons when you are satisfied with your monster. When you're satisfied with your monster, release the three buttons.

Game Shark Codes

North American Version
Infinite Offense
801557E0 03E7

Infinite Defense
801557E2 03E7

Infinite Speed
801557E4 03E7

Infinite Brains
801557E6 03E7

Infinite Bits
80134EB8 FFFF

Infinite HP
801557F0 270F
801557F4 270F

Infinite MP
801557F2 270F
801557F6 270F

Perfect Balance of Happy and Discipline
8013848A 0065
80138488 0030

Press Circle to Complete the Game
D0135450 FFDF
80134EB4 0003

Press Square to Lay Cable
D0135450 FF7F
80138460 FFFF

Japanese Version
Infinite Health
80141130 0008

Infinite HP
8016B0D0 270F
8016B0CC 270F

Infinite MP
8016B0D2 270F
8016B0CE 270F

Infinite Money
8013E294 967F
8013E296 0098

Max Speed
8016B0C0 0063
8016B0C2 0063

Max Power
80141D40 0064
80141D42 0064
8016B0BC 03E7
8016B0BE 03E7
8016B0C0 03E7
8016B0C2 03E7