Sweet Honey Trees are trees found in Sinnoh. They become "Sweet" when you coat them with Honey. These trees, when coated with Honey and left certain amount of time, will attract Pokémon only found in these trees. The rate at which Pokémon are encountered depends on the values of the player's game, also, certain trees may yield a Munchlax, which then changes the rates of the other possible Pokémon. The player can buy Honey from a man standing in Floaroma Meadow for a small amount of Pokemon Dollars. In Diamond and Pearl, the Honey only costs $100 for 1 jar, and in Platinum, the Honey can be bought at either 1 for $100, or ten for $1,000.
When left alone for a while, the tree should be shaking, and when the player approaches the tree and presses A, a wild Pokémon usually appears. Many of these are often rare Pokémon, like Munchlax, but other times, they are common Pokémon such as Wurmple.