THPS3 Tricks List
Tricks listed are for Custom Skater (one you created yourself). Other skater configurations may differ slightly.
Controller config
Gamecube: 
Flip 
Grab 
Grind / Lip Trick
Xbox: 
Flip 
Grab 
Grind / Lip Trick
PS2: 
Flip 
Grab 
Grind / Lip Trick
General
Manual
Nose Manual
+ OLLIE: Boneless
R BUTTON: Revert
+GRIND: Wallride (when approaching wall)
Flips
Kickflip
Heelflip
Impossible
Pop Shove-It
Hardflip
Inward Heelflip
Varial Kickflip
Varial Heelflip
Grabs
Melon
Cannonball
Nosegrab
Airwalk
One Foot Japan
Method
Crooked Cop
Del Mar Indy
Lip Tricks
Varial Invert to Fakie
BS Boneless
FS Noseblunt
Invert
Andrecht Invert
The Switcheroo
Gymnast Plant
One Foot Invert
Grinds
(no direction): 50-50
Noseslide
Tailslide
Nosegrind
5-0
Overcrook
Crooked
Feeble
Smith
Nosebluntslide
Tailbluntslide
Specials
GRAB: McTwist
FLIP: Kickflip Underflip
FLIP: 540 Flip
GRIND: Handstand