No.you can oly get them if you transfer them from pokemon platnum,pearl,or dimond9the pokemon transfer building is around black city if you have pokemon black or white forest in pokemon white,
PokéTransfer or Dream World, none in Black. Or White. :|
So you can give them to Dialga, Palkia, and Giratina
You can transfer your Dialga, Palkia, and Giratina to your Pokemon black or white version game (NOTE: ONCE YOU HAVE DECIDED TO TRANSFER THE POKEMON TO THE POKEMON TRANSFER LAB IN POKEMON BLACK OR WHITE VERSION, THE POKEMON THAT YOU SENT ARE UNABLE TO RETURN TO YOUR PREVIOUS GAME) or you may just use cheat codes on your AR to find any Pokemon that you desire whether it is a shiny Darkri to an average Pikachu. Have fun!
you have to transfer from diamond, pearl, or platinum or trade with a friend
Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
In black and white, if you ever get the legendary Pokemon Palkia, Dialga, and Giratina, you can give them the orbs, and they'll be stronger.
If you mean the griseous, adamant, and lustrous orbs, it's because if you were to migrate Dialga, Palkia, or Giratina, you cannot transfer any Pokemon holding items, so they give you the orbs to change Giratina to origin form, and boost Palkia and Dialga's attacks. That's really all ^=^!
In Pokémon Black 2, the Legendary Pokémon that are called Dialga, Palkia and Giratina cannot be found or captured in Pokémon Black 2. Dialga was only available in Pokémon Diamond and Pokémon Platinum, Palkia was only available in Pokémon Pearl and Pokémon Platinum and Giratina was only available in Pokémon Diamond, Pokémon Pearl and Pokémon Platinum and they were also available in HeartGold and SoulSilver via the use of the Arceus special event Pokémon that was released at Toys 'R' Us so in order to get Dialga, Palkia and Giratina in Black 2, you will need to either trade for them or you will have to migrate them using Black 2's Poké Transfer system.
You can't catch those Pokemon on Pokemon Black. You'll have to either trade for them or transfer them from a DS Series game.
Transfering it from a previous game is the only way you can legally obtain it.
you have to beat the elite 4 and the if you go to marvelous bridge the shadow triad will com and give you the griseous orb for giratina an adamant orb for dialga and a lustrous orb for palkia
Because you can't trade items from the GenIV games, they needed other ways to get certain items into GenV. Since you can migrate Dialga, Palkia and Giratina across, it's only fair that they can still somehow get their orbs in Black and White.