Why didn't thief work in white?

Question

I taught my Stantler theif and when I did the boss fight with Cheren after I beat the game at Victory Road, I used theif on his Samurott ( which has a focus slash) and after I beat him, my Stantler didn't have the focus slash. (and no she didn't use it up)What happened?! Why don't I have the focus slash?! Please help me! Thanks! :)

Edit: My Stantler wasn't holding an item before, also when I used theif, it said "Stantler took Samurott's focus slash" or something like that.

Answer 1

The Mechanics of Thief changed in Gen V, so now if you use Thief on an NPC's Pokemon, all items are returned after the battle. So you can't get a cheap Focus Sash that way unfortunately.
Source: Bulbapedia

Comments

Oh, well thats was a waste of rare candies, now I only have 8 and I had 17!

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do you have a source?

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Just edited in the source

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Thank you

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I think it was pretty obvious that you can't steal people's items for ever . . .

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Though it would have been nice if you could :)

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Yeah pretty nice!