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Yea it pretty much has to be a glitch...unless you groped it and somhow u only damaged that specific part of the game...which would seam very unlikely...but u also said u used a gameshark...that prob it....but cant you start a new game...you should be able to do that and then save it
A cartridge game will no longer save when its battery has run out. The batteries are likely dead. You could probably replace them. They're probably just standard CPU batteries.
Edit: GBC Pok?mon games only have a time counter that goes up to 255 hours (FF in hex).