(hex:BE) is a glitch item in Pokémon Yellow. It is a Rival's effect glitch item.
This glitch item can be used as a healing item to heal a Pokémon by a maximum of 80 HP (similar to a Lemonade). Its quantity will be decreased upon use. If the Pokémon's HP is full, the game will bring up the message that the item won't have any effect.