Honey

Honey is a new method of catching pokemon introduced in Pokemon Diamond and Pearl. When put on certain trees, you have to check the tree later. Sometimes there is a pokemon. You can tell what trees to put honey on by their yellow coloration. You can buy honey from a salesman in the Florama Town Meadow, located north of Florama Town. Each honey costs 100 pokedollars. You can find honey throughout the game as well. The pokemon combee's ability will find honey as you travel with it in your active party.

Pokemon found by using honey
Combee Munchlax Burmy Wrumple Silcoon Cascoon Cherubi Heracross Aipom