Precooked Burger is an item in the “Curry ingredients” category (Items). It costs ₽150.
In-game descriptions
| Sword / Shield | One of the many ingredients that can be used for cooking at your camp. If you’re unsure about what to cook, you can’t go wrong with some burger. |
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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