You can trade 10 of those for a Technical Machine or TM. I just forgot which town.
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You get the red shard from the red garados if you fail to catch it at the lakeof rage.
you give them to the guy that says shard de berry and he gives you berry's for them
It is not possible to get a blue orb in Pokemon Soul Silver however, you can transfer Kyogre from Heart Gold to Soul Silver to get the green orb in order to catch Rayquaza.
No.
after beating blue go to oaks house and he will give you rock climb