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At the end of each turn, the wielder has a 50% chance to receive a Berry that it had already consumed. If sun is the prevailing weather condition, Harvest will always activate at the end of the turn. If Harvest restores a Berry at the end of the turn, the Berry can activate immediately if the requirements are met (for example, if the restored Berry was a Sitrus Berry and the wielder is below 50% HP at the end of the turn, it will activate). Harvest will only activate once per turn. If a Berry is removed via Bug Bite, Incinerate, Knock Off, or Pluck, or taken by the effect of Pickup, the Berry cannot be regenerated.
While having a 100% success rate in the sun sounds tempting, it is important to note that using Harvest means Tropius and Exeggutor will lose Chlorophyll, which has a more useful effect. As well as this, very few Berries outside of Chesto and Lum will have any decent effects worth recycling.
Found in Dream World