(hex:69) is a glitch item in Pokémon Red and Blue.Its name is taken from the unused Japanese string "ひのたまバッヂ" (FireBallBadge), resulting in mojibake. ひのたまバッヂ is also the name of the hex:69 glitch item in Japanese versions.
Using this glitch item causes the screen to flash between different colors at a moderate speed, both from in and outside of battle. If the glitch item is used in battle, a turn will pass.