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Nothing useful. At all. If I need a heartscale or an everstone, it can take me hours of digging. I fear the day I need to dig up an evolution stone - not once in the two years I've owned Diamond have I ever found one.
I think I got nearly 10-15 Heart scales in about a day of digging. That's quite a chunk. That was back in D/P. I also remember getting tons of thunderstones, fire stones, and a handful of water stones among some of the other evolution stones.
Haven't gone digging in Platinum yet; I'm waiting till post-National Dex.