There really isn't an automated tool to do it, but there is a method. It doesn't involve hex editing, just a tiny bit of using the VBA memory viewer.
www.pocketheaven.com/ph/wiki/index.php?title=How_to_exchange_SRAM_between_the_GBA_emulators_and_PC
so the values to use will be: address = 02037E38 and Length = 8000In Goomba 2.38 Paletted+Borders current loaded game SRAM is stored on: 0x02037E38
I can't add files in a PM.send me a PM and I'll transfer the save