NBA: In The Zone 2000

Select the "New Season" option at the main menu, then press L1, R1, L1, R1, Circle, Square.

One-handed Dunk: Press Left, Right during your run up, then press X.
Back Jump: Quickly press Up, Left, Down during your run up, then press X.
Back Change: Press Left, Right during your run up then press X.
Power Dunk: Press Up(2) during your jump.
Clutch Dunk: Press Down ,Up during your jump.
360 Slam Dunk: Quickly press Up, Left, Down, Right, Up during your run up then press X.

Back Change and One handed Slam
Press Left, Forward, during your run up then press X. Press L or R during the jump at about the freethrow line.

Back Jump and Clutch Dunk:
Quickly press Up, Left, Down during your run up, then press X. Press Down, Up while in the air.

Enter the settings screen and select "Rosters". Create a player and copy Kobe Bryant. Change his statistics to 6'9", 225 lbs., and rename him Kenyon Martin. This player can make any reasonable shoot.