It is really simple. As its name says: a tool which can create the tilemap of a Pokemon game.
Type: Map Editing
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows
Not only Pokemon FireRed can be hacked, adjusted with a tool but also Ruby – Sapphire – Emerald – LeafGreen… all the games of Gen III.
If you do not want to use the GoldMap tool hack, then MegaMap will be the best alternative because its functions are totally the same as the first tool.
The tool Nameless Tile Map Editor (NTME for short) is created for editing – adding the tilemap for Pokemon Gen III games.
Nintendo Pokemon ROM Editor (NPRE for short) is a strong tool for editing and hacking any Pokemon ROM on the NDS system.