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Cancel (Generation I 0xFF glitch item)
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(hex:FF) is a glitch item in Pokémon Red, Blue, and Yellow. It is also known internally in the $CD6D buffer as "TM55".
In the inventory, this item is displayed as "CANCEL" and will hide items on the same page below it. The quantity of this item is also not displayed.
When used, it acts like a copy of HM05 Flash, except a copy of this item will be used up after the move is taught.
The name of this glitch item (CANCEL) is shared with CANCEL (0x91); a Rival's effect glitch item in Pokémon Red and Blue.