This tool is so famous for changing the Pokemon maps with so many different additions.
Advance Map
Platform(s): GBA Hack Tools
Type: Map Editing
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows
Type: Map Editing
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows