You trade them for tms from a lady in pastoria
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yellow shard and red shard and green shard
The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.
In Pokemon Pearl TM 11 can be found on Route 212. There is also a NPC in route 212 who you can give 10 Red Shards to receive another copy of TM11.
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
Red shards are found underwater.