Feeding this berry to a Pokémon while trying to capture it increases the chance of success. The in-game description of the item is misleading. It states that feeding it to a Pokémon "on your next throw" will make it easier to catch. The effect actually lasts until the Pokémon enters a Poké Ball at least once. If the Pokémon seems to be captured, but escapes the ball, the effect of the berry wears off, and another must be used. If the Pokémon does not enter the ball, such as if the player's throw misses, the effect does not disappear.