Adamant orb, Lustrous orb, and the Griseous orb why do you get them in Pokemon black and white? when I was on my way to white forest, seeing where the bridge leads. Then in the middle these three ninjas appeared they gave me these three orbs.
These bring no Giratina, Palkia, or Dialga. Sadly, they are just there to use in case you transfer any of the 3 to Black/White, as there is no other way to get these orbs, since transfering + your Pokemon holding items is not allowed.
They give it to you because there's no other way to get these items to Dialga, Palkia, and Giratina when transferred from Gen IV, as items cannot be transferred.
