Pokémon S03 E30 Tricks of the Trade

"Gotta catch 'em all!"

At the Pokémon Swap Meet, our heroes befriend a young Pokémon trainer who's having difficulties finding a trading partner willing to accept his Wobbuffet. When Jessie inadvertently deposits her Poké Ball across from his in the exchanger, this young trainer gets more than he had bargained for.