Lustrous Orb

The Lustrous Orb is an exclusive item for Palkia. When held on to Palkia, its and  type moves increase in power. In Pokémon Pearl, the Lustrous Orb can be found behind the platform the player fought Palkia. In Platinum, it; as well as the Adamant Orb, can be found in an area at Mt. Coronet only accessible via waterfalls.