To open your bag: "Press the button "X" on the right side of your DS/DSlite/DSi and you will come to a page on the bottom of the screen (The Touch Screen) and it will give you a selection of what you want to open.
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To open up your bag in Pokemon Diamond, simply press X and go to Bag in the Menu. Then, press A.
Go to your bag, go to Key Items, and then click it to open it. If you have made pokeblocks in the contest hall, you can feed one to your pokemon. If you are in the safari zone, walk up to a white platform, press A, and you will have the option of putting a pokeblock on to attract wild pokemon.
Quite tricky, open up the bag right next to the route and use the pilot liscence.
Sootopolis. You have to go through the whol Kyogre episode then the gym will open up. (Sootopolis is the white place you have to dive to get into.)
you find them in your bag underground, click on 'em, and choose the put in bag option. when you go back up, you should find 'em in the items pocket in your bag.