Berries have appeared in every mainline Pokemon game since Gen 2, and they make a reappearance in Pokemon Diamond and Shining Pearl. The Switch remakes also bring back Poffins, which are made from combining Berries.
Pokemon can also hold Berries in Brilliant Diamond and Shining Pearl. This means they will auto-use them when certain status or health conditions are met. It's a useful way to cure poison, paralyze, and other effects without having to waste a turn, or an item.
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