Pokemon Puzzle League cheats and cheat codes for Nintendo 64

Unlock everything in the Puzzle University:
Hold Z and hit A, B, R, A, A, B, R, A at the title screen.

Change marathon mode speed:
Hold Z and press B, A, L, L at the title screen.
Now you can change the marathon mode speed to maximum.
or
Reach at least 10,000 points in the time zone.

Unlock Bonus trainers
Go to the trainer selection screen and press the following button 
combination: Hold L + R + Z on controller 1 and 2. The new trainers 
marked by a "?" sign. 
or
Finish the Spa Service game.

Unlock V-Hard mode:
Hold Z and press L, L, A, B at the difficulty selection screen
or
Finish the game once in Hard mode.

Unlock S-Hard mode:
Hold Z and press R, L, A, B at the difficulty selection screen
or
Finish the game once in V-Hard mode.

Starting on Mewtwo's stage:
Hold Z and press B, Up, L, B, A, Start, A, Up, R at the trainer 
selection screen.
or
Finish the game once on the S-Hard mode.


Beat any of the characters bellow to get the indicated badge:
Badge - Character
Volcano - Blaine
Boulder - Brock
Rainbow - Erika
Earth - Giovanni
Sould - Koga
Thunder - Lt. Surge
Cascade - Misty
Marsh - Sabrina