The following are known Action Replay Codes for All-Star Baseball 2004 on Nintendo GameCube (GCN).

• Master Code (Must Be On)
  TRZQ-F12R-KP843
  3784-H897-BK002
• 1 Strike To Out
  VM5Y-3FTG-9Z4RQ
  2PQN-G7AZ-2X10R
• 1 Ball To Walk
  0WBT-CCRT-69UDC
  UAPC-5PCU-M03NG
• Create Super Tall/Short Players
  561D-JBYY-9CRPR
  WHRT-A4C1-Z0NNU
  4TAH-AFNV-RBDNV
  5Q18-WU7A-QPZJ7
  K31A-5V8G-C9CQY

Pause the Game and Press the Buttons Below

• Press R + D-Pad Up: Home Scores 99
  332Q-X8MD-43BE0
  9D6F-NYUY-X5623
  XNPU-W0N2-7U5BB
• Press R + D-Pad Down: Home Scores 0
  P414-9UPZ-27XB0
  D0RD-H897-U8Y8B
  GQA7-8R05-GX80G
• Press R + D-Pad Left: Away Scores 99
  NCD3-CNU6-J4VTQ
  EZU4-QURD-ZEK80
  2QUA-P8NY-HB322
• Press R + D-Pad Right Away Scores 0
  PRXE-JJ7G-FTXU5
  JBE4-MKJ4-V90C2
  G72N-NE86-3KWC4
• Press L + A: 3 Strikes
  700K-5B2C-YNDDN
  XZBK-4ED7-E2RNH
  D4BJ-7H6R-5FDE5
• Press L + Y: 0 Strikes
  HBHT-77BW-1R4RC
  R2YK-TB2Y-TJT9W
  HGKF-M5TK-H3V0Q
• L+D-Pad Down 4 Balls
  GCBN-CM2Q-M2XYT
  C8RD-JMMW-7V4V8
  PK1Q-VGM6-RY4U5
• Press L + D-Pad Up: 0 Balls
  9AAV-DRRQ-9TQEW
  M9F0-8PWM-AVB1N
  4VK5-TECZ-XU0D2
• Press L + D-Pad Left: 3 Outs
  WT0A-ENBM-7KY75
  EQKE-04D6-Y9GFC
  2YN1-TEZW-3PJ39
• Press L + D-Pad Right: 0 Outs
  BETF-Z656-C868J
  03RQ-4TWU-ATX29
  AWWA-C7RK-PA73H