Tony Hawk's Pro Skater 4 Cheats

When game starts a menu bar arises go to option in that and select cheats and type watch_me_xplode

To get mystery skaters you must beat the game with $42,000 or more.
The myster skaters you can get are Metal Head, Dark Warrior, Daisy,
and Mike Vallely. 

All of the following moves are performed when your character's special meter is flashing yellow:

On the options screen at the start menu select cheats.
Then type in (0)(0).
Then you should have daisy without wasting 15 thousand.

At the main menu, choose Options, at the Options screen, select Cheat Codes.

Enter Watch Me Xplode [case sensitive]... If entered correctly, you'll hear a sound.

During gameplay, pause the game, and at the pause menu, select Options then Cheats, where you can acyivate the unlocked cheats.

Enter one of the following names when you Create-A-Skater to access hidden pre-made skaters.

#$%@!
Aaron Skillman
Adam Lippman
Andrew Skates
Andy Marchal
Angus
Atiba Jefferson
Ben Scott Pye
Big Tex
Brian Jennings
Captain Liberty
Chauwa Steel
Chris Peacock
ConMan
Danaconda
Dave Stohl
DDT
DeadEndRoad
Fakes The Clown
Fritz
Gary Jesdanun
grjost
Henry Ji
Jason Uyeda
Jim Jagger
Joe Favazza
John Rosser
Jow
Kenzo
Kevin Mulhall
Kraken
Lindsey Hayes
Lisa G Davies
Little Man
Marilena Rixfor
Mat Hoffman
Matt Mcpherson
Maya's Daddy
Meek West
Mike Day
Mike Lashever
Mike Ward
Mr. Brad
Nolan Nelson
Parking Guy
Peasus
Pete Day
Pooper
Rick Thorne
Sik
Stacey D
Stacey Ytuarte
Stealing Is Bad
Team Chicken
Ted Barber
Todd Wahoske
Top Bloke
Wardcore
Zac ZiG Drake

Go to the store and Spend at least $250.