Mat Hoffman's Pro BMX 2 Cheats (GameCube)

Go to OK city.  Now go to the ramp that is
  put there with the fork lift and into the secret garage.  Now you
  must grind on that black box and it will open into a vert ramp. 
  Use that ramp and grind on the bullhorns and jump into the small room
  and you unlock Smith!
  


  

At the start screen, press L, 2(left), 2(right), left, A.

At the start screen, press Y, 2(L), 2(up).

Go to the Press Start Screen and enter the
  following QUICKLY
  
Boston - B, Up, Down, Down, Up, B
  
Chicago - B, Up, Y, Up, Y, B
  
Las Vegas - B, R, Left, L, Right, B
  
L.A. - B, Left, A, A, Left, B
  
New Orleans -B, Down, Right, Up, Left, B
  
Portland - B, A, A, B, B, Y

At the start screen, press B, 2(right), Y, down, B.

Go to the Press Start Screen and enter the
  following L, Left, Left, Right, Right, Left, A

Enter the indicated code to unlock the desired character:

  Big Foot: Y, right, up, right, up, B
  Day Smith: B, up, down, up, down, Y
  The Mime: Y, left, right, left, right, A
  Vanessa: Y, down, 2(left), down, B
  Volcano: Y, 2(up), A, 2(up), Y

Go to the Press Start Screen and enter the
  following QUICKLY
  
Big Foot - Y, Right, Up, Right, Up, B

  The Mime -Y, Left, Right, Left, Right, A

  Volcano - Y, Up, Up, A, Up, Up, Y

  Day Smith- B, Up, Down, Up, Down, Y

  Vanessa- Y, Down, Left, Left, Down, B

  

Enter the indicated code for the desired city:

  Boston: B, up, 2(down), up, B
  Chicago: B, up, Y, up, Y, B
  Las Vegas: B, R, left, L, right, B
  Los Angeles: B, left, 2(A), left, B
  New Orleans: B, down, right, up, left, B
  Portland: B, 2(A), 2(B), Y

Go to the Press Start Screen and enter the
  following QUICKLY
  
Elvis- Y, L, L, Up, Up

  BMX- Y, X, Left, Right, Left, X.

At the start screen, press Y, X, left, right, left, X.

Go to the Press Start Screen and enter the
  following QUICKLY
  
Cory Nastazio - R, X, Y, Y, X, X, X, R

  Seth Kimbrough - R, Up, Down, Y, Y, Y, R

  Reuben Alcantara - R, Left, Right, Left, Right, Left, R

  Nate Wessel - R, Down, B, Y, Down, B, Y, R

  Big Ramp - R-Trigger, Up, Down, Left, A, A, A, R-Trigger

  Day - R-Trigger, X, Left, Left, Y, Right, Right, R-Trigger

  Mat Hoffman- R, Left, Y, Left, Y, Left, R

  Joe Kowalski- R, Up, Y, X, Down, R

  Rick Thorne- R, L, R, R, L, R

  Mike Escamilla- R, Y, A, A, Y, A, A, R

  Simon Tabron- L, Z, R, L, Z, R

  Kevin Robinson- R, Y, X, Down, Up, R

Enter the indicated code at the start screen to unlock the desired video:

  
  Big Ramp: R, up, down, left, 3(A), R
  Cory Nastazio: R, X, 2(Y), 3(X), R
  Day: R, X, 2(left), Y, 2(right), R
  Joe Kowalski: R, up, Y, X, down, R
  Kevin Robinson: R, Y, X, down, up, R
  Mat Hoffman: R, left, Y, left, Y, left, R
  Mike Escamilla: R, Y, 2(A), Y, 2(A), R
  Nate Wessel: R, down, B, Y, down, B, Y, R
  Reuben Alcantara: R, left, right, left, right, left, R
  Rick Thorne: R, L, 2(R), L, R
  Seth Kimbrough: R, up, down, 3(Y), R
  Simon Tabron: L, Z, R, L, Z, R

Go to the Press Start Screen and enter the
  following B, Right, Right, Y, Down, B:  Does not unlock road trip
  levels just all other modes

At the start screen, press 2(L), down, R, X, L.

Go to LA and look for the Girl sitting down on
  top of a brick building.  You must do a 20,000 point adrenaline
  trick in front of her.  You can manual inbetween tricks so you
  don't have to pull off a single trick

Finish the game using any character and FINISH
  ALL objectives

Go to the Press Start Screen and enter the
  following L, L, Down, R, X, L