What I think minimum for GBA hacking is: 1. Xtreme Script Editor or Pokescript or any scripting tool 2. Nameless Tile Map Editor 3. Advanced Palette Editor 4. Advanced Map 5. Photoshop and Irfanview (second one to make a few things faster) 6. Hex editor (not suitable for those who don't know what to do with it.... like me ) 7. Sappy 8. To be added soon....