Question

where do you find your accessories case in SoulSilver

Answer 1

Sorry i mislead you in my comment but only in the name its not called the Accessories case but its the Fashion case. It can be found in the Key Items pocket of your bag.

Here and Here are good places for information on the Fashion case and other items

Comments

ok that helps a little more but how do i use the sinnoh sounds and hoenn sounds when looking for pokemon lol cuz i want a shinx pretty bad

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Use the item in the area where you can find shinx and hope get it to appear