Rusted Shield is an item in the “Species-specific” category (Items).
In-game descriptions
| Sword / Shield | It is said that a hero used this shield to halt a terrible disaster in ancient times. But it’s grown rusty and worn. |
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Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h