Zoroak isn't in soulsilver or heartgold. If you look at Serebii.net, its only in the yet to come out Pokemon Black and White.
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in lostlorn forest. you bring one of the shiny dog legandaries to the camper and the person is zorark.
no. you obtain it by sending over a celebi that you obtained from the Phantom Champion Zoroak movie. If you have the celebi, you can transfer it over to black/white after you have beaten the elite 4, obatained the national pokedex, and unlocked the transfer machine in Hiun City
Zoroak hasn't even came out in any games yet!!! Actually, Zoroark (and it's pre-evo form, Zorua), are introduced in the Black/White versions. You can only catch them if you have the event Celebi (for zorua)(obtained from pre-ordering the 13th movie) and one of the shiny beasts (also called crown beasts, ENTEI/Suicune/Raiku, obtained from pre-ordering tickets to Pokemon movie no13).