Pokémon SoulSilver Version Tips

Leftovers, Light Balls, and other goodies.
Obtain a Pokemon with the move Thief and make sure it is not holding an item, battle the following Pokemon and use Thief on them to obtain that item:

Koga's Swalot: Holds Leftovers
Koga's Muk: Holds Black Sludge
Red's Pikachu: Holds a Light Ball
Karen's Weavile: Holds a Razor Claw (unverified)
Morty's Dusknoir: Holds an Iron Ball (unverified)

This trick CANNOT be done at the Battle Frontier. This trick can also be done to other Pokemon that holds items (such as the Gym Leader's final Pokemon, which hold Sitrus berries).