you can trade them for moves i prefer to go to snowpoint city to trade them but there are other locations now speak to the hiker at snowpoint city (he lives at the house right from the temple) and ask him for the move you want from the list and trade the shards for the move
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You can trade them to the move tutors so that your Pokemon can learn different moves.
There are four shards in Pokemon Platinum- red, blue, green and yellow. They can all be found in the Underground.
The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.
You can get them underground.
if you have to trade shards then trade Pokemon with people eqiupe it to a Pokemon your trading and theres shard trading make sure the other trainer has equiped a shard to the tradable Pokemon