Using Rock Smash in certain places (Ruins of Alph, the Cliff Cave, Cianwood City, Dark Cave, Rock Tunnel, Route 19, Vermillion City, and Victory Road)
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In HG/SS you trade Shards for Berries. Trade with Jugglers in Violet City and Fuchsia City.
You can get them using the dowsing MCHN on the Pokewalker or you have a chance of getting them by using Rock Smash on any rock (You can get red, blue, green and yellow shards this way as well as heart scales, revives, max ethers, and fossils).
In Violet City or Fuschia City, there is a man with blond, spiked hair. He will trade you shards for berries (three berries for each shard). Each shard gives you a specific type of berry.
The weirdo next to the Pokemon center in violet city(you need shards) inside rocks,pokewalker,trades,held items(mostly bidoofs)inside pokeballs.
The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.