Instructions
Download the IPS file for the ROM you want to patch in Visual Boy Advance. Websites such as Pocketheaven have many free IPS files available.
Download the ROM file that you want to use the IPS patch on. Websites such as ROM-Freaks and Romhustler have many games available, including Japanese titles.
Extract both the ROM file as well as the IPS file you downloaded to the directory where Visual Boy Advance is installed. Rename the IPS file to match the name of the ROM file. For example, if your ROM file is called "Game01.gba" the IPS file must be "Game01.ips."
Start Visual Boy Advance and click "Options." Select "Emulator" from the drop-down menu and click "Automatic IPS Patching." This runs the IPS file directly from within the emulator without the need for any external patching. This only works if the IPS file name matches the ROM file name.
Click "File" and then "Open" to select the ROM file. The game will load and apply the IPS file automatically. You will now be able to play the game with any modifications that the patch made to it.