A glitch Ribbon refers to any invalid Ribbon in the Pokémon games.
In the handheld Generation III Pokémon games these 'Ribbons' occupy hexadecimal identifiers 41-FF (65 to 255 in standard decimal). They can give glitch dialog in their descriptions.
Glitch Ribbons are currently unavailable without a cheating device.
See also
Glitch move Glitch item Glitch contact Glitch encounter system Glitch Pokémon
External Links
Thread on the forums.