The following are known Action Replay Codes for Spirits & Spells on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
b323d5a3
97cc51a3
1cc15080
c771fce4

Invincible
1b33f148
a96463d1

Infinite Lives
a66b0ad6
b7ffe64c

Infinite Sparks
9ffa1a98
2fca89c4

Max Score
2615fcaa
c0684c97

Moon Jump
5946d1e2
2f6da0f7
45e1760a
4197c851