The following are known Action Replay Codes for Super Smash Bros. on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Master Code – Must Be On
de0004000000
f10396b02400

Infinite Lives P1 (Story Mode)
800a4b430004

Infinite Lives P2 (Story Mode)
800a4bb70004

Infinite Lives P3 (Story Mode)
800a4c2b0004

Infinite Lives P4 (Story Mode)
800a4c9f0004

Infinite Time (Story Mode)
810a4b2e43cb

Infinite Time (VS Mode)
810a4d1e43cb