If you want to past the traing you must get through the crocodile mouth walk to the water when youre at the tip of the group press > from the pad and press the jump bottle and there you are in the crocodile no.1 mouth do the same thing with crocodile number 2 if you use r4 it would be easier jump whenever the crocodile mouth is open or close or follow the instruction above.
Monk Costume
Attain Monk Rank.
Play as Chase
Defeat Mala Mala Jong in the last level of Adventure mode.
Play as Jack
Get at least halfway through the game to fight the Jack Spicer Robot. Defeat it to unlock Jack as a playable character.