Quiet Mint is an item in the “Nature mints” category (Medicine). It costs ₽20.
In-game descriptions
| Sword / Shield | When a Pokémon smells this mint, its Sp. Atk will grow more easily, but its Speed will grow more slowly. |
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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