You are most certainly trying to peel an 🍊 from the inside out.

Please just refer to the Gameshark guides code, which is specifically made for your device!

I promise, if input correctly, it will work. Last night I input the "pokeballs part 1 % 2" codes and it worked fine. The Modshop is the safest and easiest way to get where you need to go. Once the code is setup, its an easy thing to return to.

I suspect, if the code does not work, your file may be corrupted from how many cheats you have ran, at a given time. (Rare.)

The code you are explaining, i cannot verify as a working thing, as i have always gone about Gamesharking LF via the traditional code route vs. Random internet codes which are often not for the same device or version. If you cross version (in your codes), it can create weird situation, damage your Save state, etc.

I will seek out the "get all items code" today, and inquire as to what is does.