OMG! LIEK YAYAH!
More than one save file
Why would they give us more than one legendary? Moreover, why should more memory be used on extra save files when it could be used to make the game, you know, good? Don't forget that when you add a save file, you're actually adding two: a standard save file and a backup. Also, one could obtain copies of legendaries/getting all the starters/multiple rare items with this. Doing this would be detrimental not only to the gameplay, but also to Nintendo's income.