SONIC HEROES (GAMECUBE) SIZE-CHANGING CODES
JAPANESE VERSION
===========================================
(M) - MUST BE ON for codes to work
XY39-4YJP-2NTJB
PZTZ-MVCB-4WR34

(All codes found by link00y)

NOTES: DO NOT USE THESE CODES IN ANY MENU SCREEN OR LOADING SCREEN! Also, 
characters which spawn in the air won't fall down.. . they're stuck there 
if the Size code activator is enabled... there is nothing I can do about 
it, please enable moon jump when using this code, it'll allow to fight 
enemies stucking in the AIR.
(NOTE from Cinder: I am not sure this glitch applies to this version, but I'm 
including this note anyway just to be safe)

Where it says direction:
D-DOWN will shrink the chosen character until the buttons/D-Pad are released
D-UP will enlarge the chosen character until the buttons/D-Pad are released
D-LEFT will reset the chosen character to his/her normal size

Activation code (MUST BE ON)
TKM6-RTFV-6DYUE
HYEF-NEEW-28TH3
832R-J5W5-K8BTP
3YYD-DACE-R02QY
NTBT-GK62-2TW44


Speed character; press L+X+direction
A7Y8-VU93-EU6HZ
MRRT-74WG-M71AB
RNZ8-FKRB-Z2V13
R349-HWGA-N9VKN
JYNG-YU9B-2VKZP
E9FZ-A3QA-YCERP
E1F9-6E4E-QWZTQ
G9KF-GEAX-K4EFG
73UN-C7TB-FKD17
NQ9K-CGEP-PKEZ2
E9FZ-A3QA-YCERP
MDA3-9XWU-EJQ14
6W0Q-TP8J-79E6X
GC6U-5MK1-6MMT8

Fly character; press L+Y+direction
B0UJ-52AJ-PJKTA
NWND-RRE9-ZWDGB
3GDU-51PJ-4JE70
QNX3-5TQ1-XVKPT
HA7T-3169-2K3TM
E9FZ-A3QA-YCERP
28V5-CPT3-X1782
B33G-ETJR-EMY2Y
NVUX-15P2-VR36E
CMNY-47DX-CHNYU
E9FZ-A3QA-YCERP
PKKV-F2P7-EPJ8P
BHA7-RT4T-G4PND
GC6U-5MK1-6MMT8

Power character; press R+X+direction (does not affect Big)
0B55-QGV1-9Q85Y
7KH9-1ZQM-XGDFQ
65FJ-MNNH-G8K20
X96H-21W0-49KB5
9RDZ-EG6A-H17CY
E9FZ-A3QA-YCERP
T6TR-2DNW-UYG74
TY2R-ZKPD-PHKM3
BB5C-00ZP-QB1G2
3HTX-8XKN-09MCM
E9FZ-A3QA-YCERP
ZYA5-M5RA-YV88N
CD43-WHAB-13H4F
GC6U-5MK1-6MMT8

Big; press R+Y+direction (Do NOT use in combination with Power code)
G6WP-GXU9-V7REB
J8NG-JF2Y-X3W70
FB8N-H0G2-N08ZQ
5Z43-MBY4-MRVVY
0NBZ-7RPR-R3G1U
E9FZ-A3QA-YCERP
AMHZ-HHWF-ZPEQE
F6HR-G7FJ-3FUHB
5GYM-46EX-EK6YB
HTF0-XWH4-V9B22
E9FZ-A3QA-YCERP
ND3X-8NBP-3XWRP
WYGG-4AEG-M9XGE
GC6U-5MK1-6MMT8