(Request) Castlevania HOD GBA invincibilty for code breaker

[helgaharley]

I was looking for an invincibilty code for Harmony of dissonance for GBA it's hard trying to race the metal ball to get to Dracula's part when you have enemies bumping you backward.
Also could someone explain how to find invincible codes for gameboy and Gameboy advance games?

[Helder]

http://www.thegshi.org/?s=v2&sys=7&gid=290 there is a code to disable enemy collisions.