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).
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The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.
In HG/SS you trade Shards for Berries. Trade with Jugglers in Violet City and Fuchsia City.
There are four shards in Pokemon Platinum- red, blue, green and yellow. They can all be found in the Underground.
Red Shard Blue Shard Yellow Shard Green Shard Violet City and Fuchsia City
4 blue shards i think teach it to a golduck or psyduck holding the mind plate it does 100 i think !