Leftovers
1 spot to pick it up, held by Snorlax in Aredia City.
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Other Pokémon that hold it
1You meet each of these once or on a special trigger, so you cannot farm them, but each one may hold Leftovers when you meet it.
Where it lies
1- Grove of DreamsTurn left from the entrance and enter the house, then talk to the man inside.Chapter 9