Magikarp Candy is an item in the “Species candies” category (Items). It costs ₽20.
In-game descriptions
| Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A candy that is packed with energy. When given to certain Pokémon, it will increase all their stats at once. |
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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