GEN3 Flash Memory Remanence Question

[pokemontourist]

 

Silly question maybe, but would it be possible that in a GBA pokemon cartridge, old saves could be recovered from the flash memory as old files can be recovered in a hard drive with recovery programs? Or, at the very least, what data could remain and be restored of old saves? Without having started a new save file I mean, in the same play-through.