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MarshBadge (Japanese: ゴールドバッジ, Gold Badge) (hex:1A) is an unavailable inventory item in Pokémon Red, Blue, and Yellow.

In the final game the MarshBadge is added to the player's Trainer Card and not the inventory, however MarshBadge is a list entry for the badge man in Cerulean City.

The MarshBadge cannot be used both in and outside of battle. Attempting to use it will bring up Professor Oak's 'unusable' message.