You trade them in a house left of pastoria city. She gives you the TMs Hail, Sunny Day, Rain Dance, and Sandstorm depending on the 10 Shards you give her. Nothing else.
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You trade them for tms from a lady in pastoria
if you have to trade shards then trade Pokemon with people eqiupe it to a Pokemon your trading and theres shard trading make sure the other trainer has equiped a shard to the tradable Pokemon
yellow shard and red shard and green shard
yo cant get it BUT you can go to the man in the way from hearthome to pastoria and he will teach it to a Pokemon for shards.
There is no TM Bounce. In Platinum there is a move tutor that will teach it for shards, but no way to get in pearl. I know i was mad when i found out....