GBA Disassembler n e 1 ?

Hey guys,
I'm trying to create a game for GBA, to compile it as a rom file and play on my computer. The problem is, that i need various things from the game, and I wonder if there isn't any other way of ripping the sounds, graphics, even sc from the game, without being ripping sprites and recording songs to the computer while the game's active... :( Isn't there any kind of disassembler or extractor to get the files manually? I'm just asking this cause i already heard of lots of them, but actual download, none of them has. :rolleyes: anyway, i'm just asking cause you guys are the authority on GBA :D