First off, to enter these cheat codes, select "Password," on the main menu screen. Below is a list of cheat codes, I found them useful and maybe you will too. The cheats are listed in #, A, B, C order.

999,999 Dracles: 8, 9, 7, 10, 5, 13

Blue Energy Bolt Gear Obtained: 9, 2, 13, 8, 1, 12

Draculim Bars are Replaced by Sushi in All City Race and Free Run: 7, 8, 13, 12, 10, 10

Dragon Booster and Legendary Beau are Unlocked: 12, 6, 12, 10, 13, 3

Dragon-Human Duel vs Reepyr: 1, 9, 3, 6, 5, 2

Green Charging Gear Obtained: 5, 12, 13, 5, 8, 11

Shadow Booster and Shadow Dragon are Unlocked: 2, 5, 4, 11, 6, 2

Skills Competition vs Wulph: 13, 9, 8, 12, 10, 1

Sprint Meter Can't be ReCharged: 1, 7, 5, 3, 2, 11

Take Super Damage from Obstacles and Opponents in All City Race and Free Run: 11, 11, 11, 11, 11, 11

Unlimited Sprint Meter: 9, 13, 6, 5, 5, 12

If you keep on playng maximum mode your player points will increase