Instructions
Open the GameCube disc compartment and insert the Action Replay disc. Plug in a GameCube controller into controller port 1.
Shut the disc compartment and turn the system on.
Scroll through the list of countries on the Action Replay menu using the joystick on controller 1. Highlight your country and press the "A" button.
Scroll through the list of games on the Action Replay menu using the joystick on controller 1. Highlight "Sonic Adventure 2: Battle" and press the "A" button.
Input the following codes, using the joystick to select each letter or number on the onscreen keyboard, pressing "A" after each:
HQ1G-0TA8-TKE57
UUH7-P89F-K2602
GEYW-WF0N-UTYBQ
Press the "Start" button on the controller. The Action Replay will instruct you to insert the game.
Open the GameCube disc compartment, with the system still turned on. Remove the Action Replay disc and insert the "Sonic Adventure 2: Battle" game disc. Do not reset or turn the system off.
Close the disc compartment to start the game with the Action Replay cheat loaded.