(hex:A9) is a glitch item in Pokémon Red and Blue.
It is an unterminated name glitch item, hence provides the effects associated with those glitches and allows for glitches such as Yami Shop glitch and LOL glitch.
If a 0x50 sub-tile is early enough in the saved screen data, then it seems to always bring up Professor Oak's message that it isn't the time to use the item. This effect is likely shared with Dome Fossil (hex:29), but the fossil scientist at Cinnabar Island's Pokémon Lab won't recognise it as a fossil.