To edit and hack the narc files, you need to have the NarcExplorer 2.
NarcExplorer 2
Platform(s): NDS Hack Tools
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum, Heart Gold, Soul Silver, Black, White
Supported OS: Windows
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum, Heart Gold, Soul Silver, Black, White
Supported OS: Windows
NitroExplorer 3
NitroExplorer 3 is the advanced version of NitroExplorer 2 – the tool that can extract and edit ARM9 with various overlays.
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum, Heart Gold, Soul Silver, Black, White
Supported OS: Windows
Advance Series
A great combination pack that all the Pokemon game makers must have.
Type: Miscellaneous
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows
Advanced Palette Editor
When choosing a tool to edit all the palettes in a Gen III Pokemon game, do not forget Advanced Palette Editor.
Type: Miscellaneous
Compatible with: Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen
Supported OS: Windows
CrystalTile 2
CrystalTile 2 was written by a group of Chinese Pokemon game hackers.
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum, Heart Gold, Soul Silver, Black, White
Supported OS: Windows
DPP Intro Editor
Change the Pokemon appear in the intro of NDS games with DPP Intro Editor.
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum
Supported OS: Windows
DS Trade Editor
DS Trade Editor let you roam freely in trading the internal Pokemon in game.
Type: Miscellaneous
Compatible with: Pokemon Diamond, Pearl, Platinum
Supported OS: Windows