As of right now, the shards have no use on PF, but they might in the future. It's up to you if you want to hold on to them or to sell them :3
well, you download the program first, then start it up. to log in, use your pokefarm username and password. after typing in your username, press enter to type your password. then you use the arrow keys on the pokewalker to control it.
You have to acquire all the berries and go in the trailer on route 5 to sell them, then sell the shard.
take the eevee into the entra forest, find the moss covered rock and make it grow a level it depends on what game you are talking about, say its on Pokemon emerald. you go into your bag and use a leaf stone. or it could be on pokefarm. you use it but i havent figured out how yet. >.<
Bury the remains in front of the statue again to get another shard and use a chisel on the shard again.
If you mean by fire shards do you mean El shard(fire) you can only get them from El Shard (mystery) you will need to buy a El shard solver then use the solver on the El Shard (mystery) the probility of getting a El shard(fire) is %22.16 You can get El shard (mystery) from just running duengons or PvP or Henir time and space I hope this helped :)
Chaos merge shop.
every shard of every ware has a value
You use it to learn moves in a house in Blackthorn city
In Platinum, the Red Shard and the other Shards are very valuable if you want to use 1 of the 3 Move Tutors there because you have to give them certain Shards for certain moves and the Red Shard is 1 of those many Shards so that would be a reason of why someone would want to get a Red Shard.
use memory shard blue
citv
i am pretty sure you can use thief or covet on a clampearl. that will give you a blue shard. if not you can go to the abandon ship and find the water stone that is in there. (ifyou havent already.)