1% chance with the pickup ability from level 81-100. That is the only way in Black/White other than the one at Village bridge.
Does the Pokemon with Pick Up ability have to be from level 81-100, or do I have to face their Pokemon from level 81-100?
will using thief/switcharoo in a battle from a trainer get you the items as well?
or does the item not get to be kept after the battle?
For an in-game trainer: Yes. From battling another person on wireless/Wi-Fi or in the Subway: No. And I'm pretty sure that there isn't an in-game trainer with Leftovers. :tongue: