(hex:6F) ("Gold generator") is a glitch item in Pokémon Yellow (Japanese) v1.0.Its Japanese name (katakana for "gold") is one of the unused Japanese list strings. The English version mojibake for this string (and equivalent English version glitch item identifier) is #-g#.
Using this glitch item may result in arbitrary code execution at address $F080 in the Echo RAM region (equivalent to address $C080) and then (if the game does not freeze) possibly add more of the same glitch item into the inventory if the inventory isn't full. [clarification needed]