buy them from pickupstixs
summoning
you get all of the shards or buy one
There is no such thing as Blue Shards, however if you meant "Blue Charms" I have provided you with a link below that should provide the answer(s) that you seek.
Use the move dive to go underwater to find shards in the seaweed.
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.
The color shards you can find in Pokemon Platinum are Red, Blue, Green, and Yellow Shards.
You cant put the god sword shards together until after you have collected them all the i think you need a certain crafting level im unsure about the crafting part.
you can go underground if you have the mining kit and search there and you'll find all kinds of shards.
you don't. you find them.
You first have to find them when you use the explorer kit and mine down there for shards.
find the guy who collects shards and trade shards for stones
you can find shards in ruins of alpha continuasly use rock smash on all the rocks in ruins of alpha