Chestnuts are not an item in the Pokemon Mystery Dungeon games.
There are various nuts and berries in the game, though, such as:
* Pecha Berries: Heal 1/4 of the user's maximum HP.
* Cheri Berries: Heal 1/4 of the user's maximum HP.
* Chesto Berries: Heal 1/2 of the user's maximum HP.
* Aspear Berries: Increase the user's Attack by 2 stages.
* Rawst Berries: Increase the user's Special Attack by 2 stages.
These items can be found in various locations, such as:
* Picked up from the ground: Some berries and nuts can be found scattered on the ground in various dungeons.
* Bought from shops: Some shops, like the "Berry Mart," sell berries and nuts.
* Found in chests: Chests in dungeons can contain a variety of items, including berries and nuts.
Let me know if you have any other questions about Pokemon Mystery Dungeon!