Classic NES Series: Metroid Cheats for Gameboy Advance
To start with unlimited rockets enter:
These are all zeros
You will start from the beginning with unlimited rockets. If you collect a rocket pack, they will now be limited, but you will have over 160.
Enter the password:
Doing this will make you invincible (unable to die).
You will also have infinite missiles. There is a downside though, you still have to kill Kraid and Ridley and get your power-ups, and by then, most people will be bored.
If you turn off and go back on, you will no longer be invincible.
To start the garm with no powers or items enter the password:
Where all 0's are zeros.
1. Suitless Samus with wave beam, Screw Attack, 5 Energy tanks, 255 missles
2. Invinceble, Infinite everything
3. Hard Mode, Suitless Samus where you would continue if you played it before
That's all I know, but I'll be back with more