My Pokemon Ruby Can't Saving Its Progress.Why?

Well, there Could be about a few Occurences....But the Main thing is that the Internal battery ( Which Runs the internal Clock) Has Ran Dead, and Needs to be replaced.

In ruby you can not catch pokemon in from diamond and pearl because ruby is an earlier pokemon game, diamond and pearl were invented later. in other words, your pokemon ruby doesn't know and can't learn anything from diamond and pearl.

Im sorry but you cant. If you turned off your system while it was saving, the data will be gone. you cant recover lost data on any pokemon game. Sorry.

Far as I know coming from former GameBoys even to the DS. The game itself is not saved upon the actual Game itself, but the System or in the case the Gameboy. If he had played the game before most likely it is a previous saved gamed he palyed or someone else. All pokemon games have a common point, that you can only play one game at a time, if you try to start a new game, the previous saved game is deleted after saving on a new game. Granted that I have not played the newer verisons of the Pokemon, but if they are anything like the older verions. Emerald, Ruby, Red, Yellow, Green, Blue, Etc. They will delete the game once a new game is started and saved.

DrakeTech

no... u cant catch jirachi in emarald However u can use action replay codes and trade with someone like peanutoken mentioned
BUT the easiest way to get it u will have to have the following *Nintendo Gamecube *59 or more data on memery card *pokemon channel (AKA colloseam preorder disk) http://en.wikipedia.org/wiki/Pokemon_Channel *pokemon channel game finished *gamecube gameboy advance cable

your saved file was deleted and you have to start over from the begging

you cant get the file back you have to start over because all your memory was deleted and you trade it the same way you trade all pokemon games

Most of the save game issues have to do with the onboard battery dieing. If this happens, your save game will persist for a few hours and then vanish.

There aren't any cheats that I can find, but heres a link showing how to catch some good pokemon.
http://www.gamewinners.com/game_boy_advance/PokemonRubySapphireHints-a.htm

yes you have totake it apart and get a new memory your leafgreen has lost its life so it stops working