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I imported a used copy of Pokemon Diamond. I've looked through the guide book and fiddled with the buttons, but I'm still not able to start a new game and save it over the other person's file. I've tried UP+B and LEFT+RIGHT+SELECT, but those haven't done anything. I've also tried searching online, but I couldn't find anything.
I've tried that, but before I even start the game, it basically tells me that I won't be able to save it at all. At first I thought it was just because my Japanese wasn't good enough to understand, but I had a fluent friend look at it and she said that there is a way to erase the data, but that neither the game nor the guidebook say how.
I believe if you hold A+B+X+Y+Select+Start (might want to throw L and R in there just to be sure) while starting your DS, it will erase the save data on the card in slot1.
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But seriously, isn't it just like the other pokemon games? Start your new game, then save. It'll prompt you that it's erasing the other file, hit OK.