The item is still held by your Pokémon after the battle.
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Yes, you get it back righr after the battle.
Easy.Just select Pokemon on your menu then select the Pokemon you want to take the item off.After that go to item and select take.Then the item will be taken and you can give another item to the Pokemon.If you want to take an item off your opponent you have to use the move Knock off.But your opponent gets their item back after the battle!
Here's a series of steps: 1.) Give your Pokemon the item for duplication. 2.) Save your game. 3.) Enter Bill's PC 4.) Deposit the chosen Pokemon, holding the item, into an empty box. 5.) Begin switching to another empty box, but turn off the game after the saving text finishes. 6.) Turn the game back on. You should have both your Pokemon, holding the item, and the duplicated Pokemon, also holding the same item.
A Shell Bell is an item to be held by a Pokemon. If the Pokemon attacks the opponent, it heals some health, unlike leftovers that heal every turn (unless your opponent uses the move Knock Off which knocks off the opponent's item).
In the main games, there are no items that lower a Pokemon's level. However in the spin-off, Pokemon Mystery Dungeon, there's an edible item called the Doom Seed which will lower the level of the Pokemon that eats it by 1 level.