Incense

Incenses (Japanese: おこう Incense) are a special class of held items that help Pokémon to differently. This allows Pokémon to produce s containing baby Pokémon that were introduced beyond Generation II if the baby Pokémon was introduced after its evolutionary relatives.

Notably, most baby Pokémon which result from incense breeding have different Egg Move lists than their evolved forms. For example, can learn  through breeding while  cannot, and Marill can learn  through breeding while Azurill cannot.

Artwork
These are artwork of the items as seen in the Pokémon Dream World.