A cleaning test (conducted by KL-34N) must be passed before the Hero can participate in any Fossil Battles. They are required to earn a certain number of points in cleaning a head fossil - the same fossil is used in every test. The number of points required to pass the test starts at 50 and increases by 5 with each rank.
The Hero must win a battle against the rank's Master to level up. Later Level-Up Battles have preliminary matches, which the Hero must win to be able to fight that rank's Master.
Information about upcoming Level-Up Battles can be found on the second bookshelf in the Fossil Stadium lobby.
The cleaning test requirement is 50 points. The Rank 1 Master is Captain Travers.
The cleaning test requirement is 55 points. The Rank 2 Master is Wendy.
The cleaning test requirement is 60 points. The Rank 3 Master is Nevada Montecarlo.