Charizard X. Pokémon Heart Gold & Soul Silver - The Safari Zone. After you have done the Warden's second task of bringing him a Sandshrew, he will allow you to start bringing Objects into the Safari Zone.
These Objects can be placed anywhere in the Safari Zone just by pressing A when you're playing through the Safari Zone However, these Objects are not superficial and just for aesthetics, these items have the ability of drawing out certain Pokémon in each area if you place them right. Bulbapedia. Pokemon. Pokèmon. Pokemon Websites.