Never only palkia. i think that's it
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No, Only Palkia. The orb is Palkia exclusive, any other pokemon holding it would be the same as giving it a pokeball.
The only way to get palkia in Pokemon white is to trade from other games
no Legendre's can't be breeded by ditto or any other pokemon
Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
There is no other place to get it besides Mount. Coronet. Sorry