(hex:A2) is a glitch item in Pokémon Yellow. It is an unterminated name glitch item and a Rival's effect glitch item.With a 0x50 sub-tile early in the saved screen data, it appears to work as an evolutionary stone, but the Pokémon compatible with the item are unknown.
If there is no 0x50 sub-tile in the saved screen data, the game may freeze after the player presses A on this glitch item.