Pickup

In Pokémon ChampionsGen III

Game

Pokémon Champions

If this Pokémon has no item, it finds one used by an adjacent Pokémon this turn.

Who has it: 19 Pokémon
Showdown rating

How it works in Champions

At the end of each turn, if this Pokémon is not holding an item and at least one adjacent Pokémon used an item during this turn, one of those Pokémon is selected at random and this Pokémon obtains that Pokémon's last used item. An item is not considered the last used if it was a popped Air Balloon, if the item was picked up by another Pokémon with this Ability, or if the item was lost to Bug Bite, Corrosive Gas, Covet, Incinerate, Knock Off, Pluck, or Thief. Items thrown with Fling can be picked up.

“The Pokémon may pick up an item another Pokémon used during a battle. It may pick up items outside of battle, too.”
In-game text, Scarlet & Violet

Changes over time

How Pickup changed from game to game, newest first.

Gen VIII
… item was lost to Bug Bite, added: Corrosive Gas, Covet, Incinerate, Knock Off, Pluck, or …
Gen V
Before: No competitive use.
Now: At the end of each turn, if this Pokémon is not holding an item and at least one adjacent Pokémon used an item during this turn, one of those Pokémon is selected at random and this Pokémon obtains that Pokémon's last used item. An item is not considered the last used if it was a popped Air Balloon, if the item was picked up by another Pokémon with this Ability, or if the item was lost to Bug Bite, Covet, Incinerate, Knock Off, Pluck, or Thief. Items thrown with Fling can be picked up.

Descriptions: Pokémon Showdown’s for each generation, and PokéAPI’s notes on the changes they don’t show. Champions: Pokémon Showdown.