When does the ability Pickup activate?

Question

I'm wondering whether or not Pickup activates for these things:

• Wild Battles
• Friend Safari
• Battle Chateau
• Trainer Battles
• Battle Masion
• Wifi Battles

It would be great if anyone could tell me whether or not it activates for each one.

Oh, and by the way, I mean the "Outside of Battle" from Pickup's page, not the in-battle one.

Answer 1

It activates for all of them, but you cannot keep the items in Battle Maison, Trainer Battles (Battle Château is the same thing) and WiFi Battles.

Source: I tested

Comments

That's too bad (esp. the trainer battles).  Thanks!

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I had to undo the BA because this answer is wrong.  I tested and found out that you can keep items from trainer battles/battle chateau.

Answer 2

Pick up does pick up items that the other Pokemon is holding, it will not pick-up items in wifi battles or trainer battles. Only in wild- Pokemon appear battles. Pick-up could be destroy by these moves:

• Bug bite
  -Knock OFf
  -pluck
  -incinerate
• a popped air ballon cannot be picked up