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The Apicot Berry raises the user's Special Defense by 1 stage once the user is brought down to 1/4 or lower of its HP. Consumed after use. Natural Gift becomes an 80 Base Power Ground-type attack when the user holds this Berry, but the Berry is consumed after use.
The Apicot Berry is not quite as powerful an item as Liechi, Salac, or Petaya Berries, which raise attacking stats, as once you are down to 25% of your HP, defensive stats aren't really going to save you—and with an Attack or Speed boost, you may well be able to kill something before going down, or even pull off a sweep.
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