You can copy games from one PSP memory stick to computer and then copy to another PSP's memory stick. Make sure you put the game on the folder 'GAME' on the memory stick.
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you can just take the memory card out of the first PS3 and transfer it to the other PS3
put your wallpaper on the memory stick. than take the memory stick out of your and put it in the other psp and go to memory stick under photo and make it your new background. also you can plug it into the computer and transfer it onto the PC then put it on to the other psp by plugging that one into the PC.
Yes, you can transfer it as many times as you want but you can't transfer it to the same game pak save file meaning if you want another one you would have to trade the current one you have to another game then restart the game the Jirachi came from and complete all of the requirements before acquiring the Jirachi again.
no there will never be one since manufacturer start making game for psvita
No, sorry. You would have to download a program meant for computers but you will run it on your PSP and it will crash and you will have to buy another one.