Win the Final Battle easily:
First off get the Osprey. This will allow you the gain great damage on the Boss.


Level Password
2     Up, X, Triangle, Right, Left, Square, Circle, X
3     Triangle, Circle, Down, Left, Square, Square, Up, Up
4     X, Right, Left, X, Circle, Square, Square, Triangle
5     Down, Down, Circle, Square, Circle, Square, Right, X
6     Triangle, X, Up, Left, Right, Left, Circle, Triangle
7     Right, Square, Right, Down, Circle, X, X, Right
8     Triangle, Right, Square, Square, Circle, Down, Down, X
9     Up, X, Square, Left, Right, Circle, Left, Left
10    Triangle, Up, Circle, X, Square, Down, Down, Down
11    Circle, Circle, Up, Left, Right, X, Triangle, Square
12    Right, Up, X, Right, Circle, Square, Triangle, Circle
13    Left, Left, Triangle, Circle, X, X, Down, Right
14    Square, Right, Circle, Up, Down, Square, Down, X
15    Left, Right, Circle, X, Square, Down, Down, Circle
16    Triangle, Circle, X, Right, Right, Circle, Square, Down
17    Square, Up, Up, Right, Left, Square, Down, X
18    Circle, X, Right, Triangle, Square, Up, X, X
19    Down, Right, X, Square, Right, Up, Circle, Circle
20    Up, X, Circle, Up, Left, Square, Circle, X