Trainers, translations and other ROM hacks to be applied on GameBoy Advance ROM images.
Tools, file formats and techniques for editing commercial games are also discussed in GBAtemp's ROM hacking section which will have additional information for the GBA, DS and more.
Many tools are useful across systems (a hex editor works much the same regardless of the system you are working on) so do also check out the Filetrip's general programming tools section.
@salazarcosplay, if you ask how am I, well... aside from the fact that i cant stop thinking about killing myself i guess im fine, and my throat got better
If you decide to take the easy way out, at least do it some interesting way, like 5 fishing magnets and ropes... Run out to the space x rocket as it's about to take off.... Ohhhh add some snow skiis and skii into to space!!!