This item can be found in Obsidian Fieldlands, where the tall grass is, and near it, you will find the Medicinal Leek on the ground. But if you are in a hurry, you can buy it from Jubilife Village for 120 Poke Dollars.
Now that you know how to find medicinal leeks in Pokemon Legends Arceus, you can prepare potions with this material, so go for it as soon as the game is released.
The Pokémon Company, Nintendo
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