You can go back to a previous save file
To do this, go to C:\Users\(Enter user here)\Saved Games\Pokemon Rejuvenation and delete the save file(s) where you are stuck in the wall, being the current Game.rxdata(or Game_2.rxdata,etc) and rename one where you haven't lost the the timburr and conkeldurr Game.rxdata(whatever the old one was)