Quick Candy XL is an item in the “Vitamins” category (Medicine). It costs ₽20.
In-game descriptions
| Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A huge candy that is packed with energy. When given to a Pokémon at Lv. 60 or higher, it will increase that Pokémon’s Speed stat. |
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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