Go to the moomoo farm on route 38 and feed the sick MILKTANK oran berries till he feels better. then talk to the girls surrounding MILKTANK and you should get a seal case and some seals.
You can find the Seal Case by feeding the Miltank Oran Berries at Route 39
5 or 6.
A Seal Case, after giving it ten Oran berries.
A fashion item that is contained in your case.
Y
No you do not need to help the miltank it is recommended though. You need to give it 7 oran berries then you will get a Seal Case and some seals. Which can customize the way your Pokemon enters the battle.
in a house near the ruins
talk to little boy in salaceon ruins. go to his house his mom gives u a seal case
U get it at the right of solaceon
no you can trade soulsilver pokemon to black
he is not in Pokemon soulsilver or Pokemon heartgold
Receive from Mr. Game at the Goldenrod Game Corner.