The following are known Action Replay Codes for SpongeBob SquarePants: Battle for Bikini Bottom on Nintendo GameCube (GCN).

Master Code – Must Be On
TPZF-VD7E-6HJFH
F8QV-HAPJ-0AR6A

Infinite Underwear
EE7B-GADP-MMARG
QQTM-2TKP-2PKCA

Max Underwear
93JY-5Y42-Q9GD5
EXTN-GYHQ-T1GZQ

Max Shiny Objects
MHWV-XDEM-N6XW4
Y7Q4-UR2F-K6RCD

Max Spatulas
YMR5-H4EM-9GPV9
D8CR-8BF6-6R6EG

Max/All Socks
8UHF-NUY3-0FBMK
2M32-40H0-42UVA
9D7Y-XQFT-BM9U2
RJR5-P95J-FH7UZ

Max Wheels
DP44-50WD-RHM1W
3QU9-1JK1-EHR9G
B9J5-HRJT-0GU5V