One player lost a save. What to do? The Legend of Zelda: Tri Force Heroes
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Possibly have your friend use download play. Sadly, they'd need to do either all the levels again, or possibly just need the experience as opposed to the stats. With no friends with this locally, I'm just guessing, so your idea is as good as mine.
If you're playing download play, you can only continue off of where the person with the cart was last. Therefore if he lost his save completely, you all must start over from the beginning again. As the above user said; just play the 4th level in every area (the boss) until you get to whatever level you were on last time. It shouldn't take too long to get back your progress if you know how to defeat them already.
Unless I state otherwise, assume by default everything I am saying is merely an opinion.