no keldeo is a 5th generation pokemon it wont work on previous generations
ignore this idiot he has no idea what he is talking about. You can, if it is not in its resolute form. this means you have gone to pledge grove, taught it secret sword, and its form has changed. in this case it is unable to be traded. But, if it is in its original form, then it can be transported out like any other generation 5 pokemon, hence the other guy being an idiot. you obtain the national pokedex, go to route 15, and transfer at the poke transfer lab.
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sorry you have to trade it to Pokemon soul silver
some sets are black and white and heart gold and soul silver
No only in diamond and pearl and in the upcoming black and white games
go on serebii.net and look at their pokedex. it will tell you all Pokemon from kanto to Iishu (Pokemon black/white)
You can only trade Pokemon from Soulsilver to Black. You can only trade back if it is one of the 4 previous generations.