The internal battery in your game cartridge has died.
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It probobly doesn't have enough battery. Take it to GameStop to get a new battery. ------ Pokemon Yellow doesn't have an internal clock battery, Gold And Silver do. There are glitches that stop Yellow from being able to save. If you've attempted these glitches or accidentally found them, that's why.
yes you can you have to use the time machine on the second floor on any Pokemon center but make sure you don't have Pokemon from gold or silver in your party b/c it wont let you do it, and if a Pokemon knows a new move that doesnt exist in red, blue, and yellow than it wont let you trade. Pretty much don't try to trade anything new from gold to blue b/c it wont work and it will tell you to get differernt Pokemon.
In Pokemon Gold, the Copycat Girl will give the player the rail pass when they give her a doll. The doll can be obtained from a member of the Pokemon Fan Club in Vermillion City.
get nogba and extract it then put it on your destop and play the game then save it and then go to battery on nogba and there will be a new save file
Your game as corrupted or in other words stuffed. The same thing happened to my Pokemon silver and gold so yea i know what it feels like.