4th Gen Most Common Item in the Underground?

[Strdstwanderer]

i got to say heartscales are pretty common find for me

 

[Starlite]

I've been getting Fire Stones a lot lately. O.o Although, it's the shards that have been the most common for me since the beginning. ^^

 

[Soggy]

I keep getting leaf stones. It's especially annoying when I'm looking for a different kind of evolutionary stone.

 

[wolf]

I must be getting lucky. I run into a lot of Heart Scales.

Heart Scales are actually not that rare. Game Freak just says their "rare" in the description when they are actually uncommon.

I find a lot of Fire Stones, Fossils, Hard Stones, Heart Scales, and some shards.

 

[Zelda]

Recently I have been finding star pieces. At least they are good to sell and make some money off of them.

Moon stones are appearing a bit more as well, but not as much as Red Shards and all the other shards.