The theory goes, that when N was adopted by Ghetsis as "his son" it was when a young Zorua had gained the curiosity to transform into a human child. However, sometime between this, the Zorua had either lost some of it's memory, or considered itself human. One day a man approached this Zorua in the wild and led him on to believe he was his son. Bringing him Pokemon that were injured by humans, N could feel hatred to humans, his "fellow race" that he had grown accustomed to, as two women had raised N to be "human." (BW 2). As you looked at the claw marks on the skateboard ramp in N's room, you assume it was from playing with Pokemon. But this is not the case, why would a Pokemon leave such rough claw marks? N had evolved into a Zoroark one day, and upon this discovery, remembered what he was, but he couldn't accept it at the same time. Being a "human" that could talk to Pokemon, it felt unique to him. In rage of evolving, he began slashing around his room. After he had calmed down he came up with a new appearance. He hated humans, for treating pokemon badly, confining them in PokeBalls, the thought of it digusted him. Perhaps even, Ghetsis could have had N in a Pokeball at one point as punishment. N one day ,found a way to avoid this, by locking the pokebal inside a cube, and destroying the key.
Fastforward years later, you're Black/White/Hilbert/Hilda. You go to Lostlorn forest and discover a young woman in a trailer. Not soon after you find that she was a Zoroark the whole time. After capture, a backpacker tells you about her and seems rather easy-going about it. 2 years later, Nate/Rosa return to that very same spot, the trailer is gone, and in it's place is a backpacker, likely the same backpacker from before. He tells you the story of the young zoroark who tried to be human. But goes on to say that it might not be possible to share this trait with other humans. He tells you things may not always be what they seem, as he walks away, he turns into a Zoroark and flees. That's 2 cases of Zoroarks trying to be human, and talking human language. When you have the memory link active, and return to the former plasma member's base, you are greeted by a Zoroark who shares one of it's memories with you. This memory didn't involve a Zoroark, but rather - it was one of N's memories. After the defeat of the elite four, Hugh's sister has a dream,a dream where she is confronted by a Zoroark, telling Nate/Rosa to go to victory road, that's right, a Zoroark talking. As you go to Victory Road, you see a Zoroark on the path, you follow it's trail to find the ruins of N's castle. The Zoroark seems patient with you, it goes into the castle quickly, and you follow. But when you enter, there is no Zoroark waiting for you. There is N. He tells you a bit of his story..he acts confused, and as he becomes your "tag partner" or double battle partner, each area, he says many different things. When you go into his room, a cutscene plays where he has bad memories. As you talk to him when you travel the castle, he hints that he was raised "...as a human..." not born human ,but RAISED as a human. He still hides this from you in fear that you'll neglect him or run away from him. However deep down he knows that you know. As you come back to see him, he is trying his best to become a Pokemon trainer, a human. N is the third Zoroark that has succeeded in an attempt to blend in.