The Adamant Orb is an item which raises the power of Dialga's moves. In Diamond/Pearl, it is found at Spear Pillar, and in Platinum, it is found at Mt. Coronet.
The Griseous Orb is the Orb that enables Giratina to be in Origin Forme, outside of the Distorition World
Hard Stone are items found in the Pokémon video game series. They increase the power of Rock-type attacks when held.
The Miracle Seed when held by a Pokémon increases the power of the holder's Grass moves by 10% in earlier games, In Generation IV it increases them by 20%. Available at some Pokémarts for a cost of 100. When flung inflicts regular damage with 30 power.