Yellow Nectar is an item in the “Species-specific” category (Items). It costs ₽300.
In-game descriptions
| Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A flower nectar obtained at Melemele Meadow. It changes the form of certain species of Pokémon. |
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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