If you have the Skin for the Titan you are battling then all you need to do is hit it once and you will instantly jack it. Eg: If you have the Battler Skin then one hit will stun a Battler
Or if you beat the game on hard difficulty then you will have a permanant Free Jack Kick meaning you will never need the masks again
To turn crash into a shadow, pause the game.Then hold the C button wile pushing B,B,Z,Z,B,Z,B,A. Finaly unpause the game and crash will be a shadow.