Hex Maniac Advance (HMA) is an all in one binary hacking tool that allows you to edit the English Version of Generation 3 Pokemon games (Ruby, Sapphire, Emerald, FireRed, and Leaf Green). 

"HexManiacAdvance is now a must-have binary hacking tool. It does what  all the old tools did but better and safer, essentially being an all-in-one toolkit. You can make an entire hack using only HMA, and when that's combined with its QoL features and safety nets to not break your rom, there's no reason to use tools of the past. I'm especially impressed with how its new map and script editors have ousted AdvanceMap and XSE - tools that were the only option for a decade - by immediately  being 10 times better to use. It has changed the binary hacking standard to the point where classic binary hacking and HMA hacking are completely distinct and I can't imagine working without it."     -Asith