Alive Aqhu card (from Viviana):
Complete "Chance Meeting".

Beat card:
Use a memory card with a saved game file from Sonic Heroes .

Broom card (from Relmitos):
Complete "A Brief Rest".

Bullet Storm card (from Kylria):

Canadine card (from):
Complete "Nostalgic Spot".

Cave Wind card (from Peko):
Complete "Cake of Dreams".

Chain Sword card (from Saligun):
Complete "Emotions Clash".

Clippen card:
Use a memory card with a saved game file from Billy Hatcher .

Companion card (from Creinu):
Complete "Jewel Fountain".

Del Rappy card:
Collect all 477 cards (All N4-SS).

Dice Fever + card:
Collect all Assist cards (N4-SS).

Halloween Rappy card:
Use a memory card with a saved game file from Sonic Heroes .

Harisen Battle Fan card (from Glustar):
Complete "Dream Present".

Madam's Umbrella card:
Use a memory card with a saved game file from Sonic Mega Collection .

Madness card (from Orland):
Complete "Test of Power".

MC Guard card (from Teifu):
Complete "Tough Partner".

Mighty Knuckle card (from Hyze):
Complete Song Request".

Nano Dragon card:
Use a memory card with a saved game file from Phantasy Star Online Episode 1 And 2 .

Pal Shark card (from Rio):
Complete "Evaluation".

Pan Arms card (from K.C.):
Complete "Looking Inward".

Parry card:
Collect all Actions cards (N4-SS).

Punch card (from Rufina):
Complete "The Real Me".

Rage card:
Use a memory card with a saved game file from Sonic Adventure 2 Battle .

Recky card:
Collect all Creature cards (N4-SS).

Red Ring card:
Collect all Item cards (N4-SS).

Round Slay card (from Reiz):
Complete "Flashbacks".

Sange card:
Use a memory card with a saved game file from Sonic Adventure DX .

Sonic Knuckle card:
Use a memory card with a saved game file from Sonic Heroes .

Split Boost card (from Ohgun):
Complete "Save the Rappy".

Territory card (from Stella):
Complete "Great Rescue".

VIP card:
Naming your team online VIP will increase your chances of getting a VIP Card.

Dressing Room:
Successfully complete both the Hunter and Ark storylines in Story mode (offline) to unlock the Dressing Room. It will disappear after each use, but will reappear again each time either the Hunter or Arkz storyline is completed once more.

Chair in Lobby:
Hold X and press A or B while standing in an online lobby to create a Photon Chair that matches your character's Section ID. Press A to move forwards or use the Analog-stick to turn. Press B to get rid of the chair.

Billy Hatcher And The Giant Egg trailer:
Note: This trick requires a Gamecube keyboard. Hold B + G at the title screen to replace the introduction sequence with a trailer from Billy Hatcher And The Giant Egg .

Control loading screen:
Use the Analog-stick to change colors and/or tap A to make a chime at the loading screen.

Saved game cards note:
When trying to get a card from having one of the following saved games, press Start at the title screen. Then, select "Offline Game", then "Story". Highlight a saved file, then press the A . Select "Confirm" then, "Story". Select the "C.A.R.D. Trading Machine", then choose "Search Event Files". If you have one of the saved game files from one of the following listed games, a message will appear confirming that another card has been unlocked.

Akiko's Frying Pan card:
Enter offline free battle mode. Find the man that love toys and cider. He is standing in the room in front of a locked door green hallway. His name is Ratts. He wants you to find "Real Cider" for him. Go to the middle of the morgue and talk to one of the men with the helmets. He will give you Homemade Cider. Take this back to the Ratts and give it to him. He will not like the cider and tells you again that he want "Real Cider". Go to secretary and you will get fifty Cakes. Take it to him. He will not like the bribe and will not give the Cakes back. Go to the middle of the morgue and talk to one of the men with a rifle on his back. He will give you a Vintage Cider. Take this to Ratts and he will not like it. Go to the middle of the morgue and talk to one of the men with the helmets. This time it is a different one and he will give you a Name Cider Nut. Go to Ratts and he will give you Precious Cider. Take this Precious Cider back to the man you got the Name Cider Nut from. Then, take the Treasured Cider to the Ratts and he will make his apprentice. You now have to look for his three apprentices. They are located in the following locations: where you load your game (red hallway); next to mission/quest teleporter (man with a helmet, blue hallway); and close to lab chief (purple hallway). Go to Ratts and he will give you Ratt's Autograph. Finally, go to story mode and talk to Ratts. He will give you the Akiko's Frying Pan card