It's possible you're thinking of:
* Music Mods: These are custom modifications made by fans that change the music in the games. However, these are not official releases and require modifying the game files, which can be tricky and might void your warranty.
* Cheats: While some cheats for these games exist, they generally focus on things like catching Pokemon or getting rare items, not modifying the music.
If you're looking for music from the games, you can find it online on sites like YouTube or on fan-made music compilations.
Let me know if you have any other questions!