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???????? (Octomark) are invalid/glitch items in Generation III. The hex:FFFF "????????" can be distinguished for having the 'return to menu' sprite as its sprite.
These items are available through a double corruption with the Pomeg corruption glitch to force a Pokémon holding one. It is also possible to obtain a ???????? with the Mail and Trick glitches in Japanese Pokémon Ruby and Sapphire.
One way of obtaining them with the Pomeg corruption glitch is through corrupting the in-game trade Pokémon DOTS the Seedot with Defense and Speed EVs spelling out the index number of the desired items with at least 1 HP EV (so it isn't corrupted into an empty space).