Zorua disguises itself as a number of different pokemon in the alleyway's. it only disguises itself as zangoose ONE time, thereafter if you see a zangoose, its a zangoose. i saw it as lets see. Starly, Zangoose, and Zigzagoon that i can remember offhand. but its obtainable right now, i just got one a couple days back
oh and another tip for finding it - Zangoose i always saw in trashcans, Zorua more often than not was not in them. but you pretty literally have to search EVERY alleyway to find Zorua. just remember - if you see any pokemon hiding in the alleyways for any reason... there is every chance its Zorua, not whatever it seems to be