they come from the clamperl
Blue shards are found underneath the water while diving.
They can't be bought. You can find them underwater, or attached to wild pokemon. Chinchou have yellow shards, Clamperl have blue shards, Relicanth have green shards and Corsola have red shards.
Catch Clamperl, Chinchou and Relicanth most of these Pokemon hold shards
Use the move dive to go underwater to find shards in the seaweed.
The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.
Red shards are found underwater.
Pokemon blue to ruby is sapphire.
Green shards are found underneath the water (or in the sand on islands) while diving.
nothing
dork...
There are four shards in Pokemon Platinum- red, blue, green and yellow. They can all be found in the Underground.
You can trade them for evolution stones eg. yellow shard = thunderstone