(hex:84) is a glitch item in Pokémon Yellow.
As its effect pointer is the same as item 128, it is functionally the same as a Poké Ball with an unknown catch rate multiplier (from Poké Ball's effect but possibly not the same), and returning Professor Oak's unusable message when used outside of battle (when D056=00) when a 0x50 sub-tile is early in the screen data.
However, it is not known how to achieve this in battle and typically the glitch item will freeze the game in battle.
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