When used from the Bag on a wild Pokémon, it increases the chance of getting more item rewards for catching Pokémon. The effect wears off if and when the wild Pokémon breaks out of a thrown Poké Ball.
The Silver Pinap Berry adds a ×2.334 multiplier to the Candy reward, more than from a normal Pinap Berry, and adds a ×1.8 multiplier to the catch rate of a wild Pokémon. The Berry's effect lasts until the wild Pokémon breaks out of a thrown Poké Ball.
Feeding a Silver Pinap Berry to a Gym defender increases its motivation by twice as much as Razz and Pinap Berries do.