Keitaro2

As I understand it, there are two saves stored in a gen 3 save--the main one and a backup of the previous save. I accidentally saved my game after doing something I didn't mean to, and am wondering if it is at all possible to access the backup save and get a Pokemon back from there. I couldn't find any information in the editor about this, so forgive me if it isn't possible or if I'm misunderstanding how this works.