you can trade shards for stones in hunters house. His house is southwest of mossdeep.
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if collect green shards you well be able to trade to the hunter for leaf stones
In HG/SS you trade Shards for Berries. Trade with Jugglers in Violet City and Fuchsia City.
You don't trade the shards for stones, you trade them for berries. You trade them with the man standing outside the Pokemon Centre in Violet City, and you'll get 3 berries from a specific set depending on the colour of your shard
Sadly, no. You can get stones in the underground. Just keep digging.
You can't. You can only trade it for TMs,10 red shards-sunny day,blue-rain dance,green-hail,yellow-sandstorm.