how to use pick up on a pachirisu in platinum

[Zippy]

how do you use pick up on a pachirisu in pokemon platinum?

[Zidarose]

Pickup is what most would call a passive ability.
It has a chance that when you win a battle that the Pokemon will find an item on the ground. There is no on-screen notification, instead, the Pokemon will simply be holding the item. So, when you have a Pokemon with Pickup, regularly checking your team is essential, as this could lead to missed items.

Taking the item is fairly simple, done through the Pokemon menu by selecting the Pokemon holding an item and choosing to take it.