VolcanoBadge (Japanese: クリムゾンバッジ, Crimson Badge) (hex:1B) is an unavailable inventory item in Pokémon Red, Blue, and Yellow.
In the final game the VolcanoBadge is added to the player's Trainer Card and not the inventory, however VolcanoBadge is a list entry for the badge man in Cerulean City.
The VolcanoBadge cannot be used both in and outside of battle. Attempting to use it will bring up Professor Oak's 'unusable' message.