First you need a seal case from a boy who lives in solaceon town.(first you gotta find him in the ruins). Then go to sunnyshore city and go to the market. The merchant in the top left will sell you seals that are different each time. To apply seals to your pokeballs go to anywhere with a pc. Pick the option with your name in it. Pick ball capsules, Then you pick one of the blue capsules, touch and drag the seals on the left to your capusle. Experiment. Then pick the option set and you can put it on your pokemon. Pokemon cannot be sent to a PC or traded unless you unset the capsules.
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It is not possible to get the Seal Bag in Pokemon Diamond. The Seal Bag currently has no use and is likely something left over from development. It possibly used to have the same role as the Seal Case but got changed during development.
you get it from a clown in vermilion city EDITED THIS IS DIAMOND!!!!!!!
If you put a seal on a pokeball on the game computer, when you throw that Pokemon out, it will show the seal show then. (Don't worry! It took me a while to figure that out too!) Hope this helps!
You go to a house near the Solaceon ruins with the woman and the kid, and talk to the woman.
Pokemon diamond
Go yo your PC Click ball capsules click the one you want the Pokemon off then click remove Hope this helps :)
In solaceon town, go to the old lady's house which is in the east, talk to her and she will give you the seal case.
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Solaceon, enter the ruins on the east side of the town, talk with the boy. After that, visit him in the nearby house.
go to soleancing town and then take a left before leaving and go to the second house on the right
you cant be a Pokemon in Pokemon diamond