Once you have the Berry Grow thing, you can plant the Oran Berries into it. It may take awhile though, like a couple of hours.
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well you can't them off tree's you have to grow them in the berry pots
Regular BERRIES. (Oran Berries in HeartGold).
if you go to dept store in goldenrod city and go to the 6th floor then go the prize draw place then wait until you get an oran berry.Get them from the Man next to the Pokemon Center in Violet City and give him a few Blue Shards and he'll give you a few Oran Berries grow more Oran Berries in the Berry Pots.
after you give the miltank all the seven oran berries (its random the number of oran berries mine was 14 there diffrent oran berries you have to give it some times)they will give you the seal case.
You can't exactly buy oran berries. They are found on trees on paths and tree patches.