In order to put a fossil you find in the Underground in your bag in Pokémon Diamond, you first have to be in the underground area. Next press the "X" button to pop up the menu and then select the "Treasures" selection and press that. Now find the fossil you want and press that. You'll see 3 options pop up on the next menu: "Put in Bag," "Trash" and "Cancel." Press "Put in Bag" and it'll be sent to your Bag above ground.
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Make sure you have put the fossil in you bag. Press Y and select treasures select the fossil and select put into bag. Then you will be able to exchange it for a Pokemon.
What you have to do is when you are underground(on Pokemon diamond/ pearl) you put the fossil in your bag. Next go to the city where you get your first bag , go to the mine go inside talk to the man. He will ask you to go outside just go in and out. Talk to him again then he will give you shieldon or cranidos.
Press A on the item you want to put in your bag and select put in bag.Next time give me a harder question.
You can't! You use your bag. You can't put it in PC like you do in the other Pokemon games.
Select the heart scale in the treasures pocket, then select the put in bag option