Sappy + Mid2Agb are two tools that can be used for editing the music in Pokemon Gen III games.
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows
Shinyzing Pokemon does not make anything different except that Pokemon will become shining with a golden color.
PPRE was a part of the Project Pokemon’s ROM Editor, a very small part but powerful enough to edit the ROM at those days.