There are four shards in Pokemon Platinum which are the red, blue, green and yellow shards. These can all be found in the Underground and they are also held by certain Pokemon. I know that Corsola can hold a red shard and that Relicanth can hold a green shard. The shards can be traded with various move tutors who will teach your Pokemon an attack in exchange for a certain combination of shards. The three move tutors are found on Route 212, in Snowpoint City and in the Survival Area.
You can either dig them up in the Undergound or you can find them on the ground all over Sinnoh by using the Dowsing App. on the Poketch.
there isn't one you just sell the mushrooms
You have to buy it. Then face a yellow tree and press A
308 m to tip
You can either sell star pieces or go to Fuego Ironworks by surfing to it just outside Floarama Town. Then talk to the manager of Fuego Ironworks and he will give you 1 Red Shard, Blue Shard Green Shard and Yellow Shard for a Star Piece.
The shard collector is in the route in between Pastoria City and Hearthome City. Her house is right after the mud area.
yellow shard and red shard and green shard
I think Clamperls have the shard,but it's completely rare.After you get the shard,go to shard collector's house.
you have to get a blue shard and then give it to shard dude (i dont know his name) BLUE SHARD=WATERSTONE RED SHARD=FIRESTONE YELLOW SHARD=THUNDERSTONE GREEN SHARD=GRASSSTONE
Kiba - 2006 The Yellow Shard of Happiness was released on: USA: 14 July 2006
Red Shard Blue Shard Yellow Shard Green Shard Violet City and Fuchsia City
Go to the left of Pastoria City and you will find a large mud pond. Cross this pond and you will find a house with a pink lady with a parasol outside. The man inside the house accepts one colour shard, I don't know which though. Another is in the top right corner of town in Snowpoint City. This man accepts a different colour shard to the others. There is a third man who will accept the last colour of shard but I have yet to find this one.
find it using dive
None, stupid.
You can give your shards to people in various houses around Sinnoh. They all have a sign outside saying 'Shards wanted!' To get you started, there is one on the beach east of Pastoria.
dive any where possible between mosdeep and lilycove and get a yellow shard go to the guy who lives on an island and he will trade a thunder stone for your yellow shard