Can an NPC trainer use a stealing move on the player?

Question

I'm a little worried that my Mega Stones and hold items will be stolen by an NPC trainer.

Comments

https://pokemondb.net/pokebase/202697/do-any-ingame-trainers-pokemon-know-thief-or-covet

Answer 1

Yes, NPC can use moves like thief. But, they can't keep items like a mega stone. Items like berries can be stolen, and you will not get them back. So, no need to worry, because you keep the mega stones. I hope I helped :)

Comments

Do you know all the items that can be stolen?

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Anything except for Mega Stones, Z-Crystals, Griseous Orb (if holder is Giratina), Arceus plates (if holder is Arceus), and Memories (if holder is Silvally). That should be everything.

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How do you know?

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https://m.bulbapedia.bulbagarden.net/wiki/Trick_(move)
I think it’s reasonable to assume items listed here also apply to moves like Thief and Switcheroo.

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The article says no items are switched permanently after Generation 5.