Cant find azuril? Probably not in the wild. To get him, you need to perform a special trick with the day care man. Catch a girl maril and a boy maril, give the girl maril a sea incence to hold and put them both in the daycare in four island. The old man should give you an egg eventually if you walk around for a while. If you put the two pokemon in the daycare and the old man says they prefer to play with other pokemon, try switching the boy maril with another male pokemon. You should keep switching the boy maril until the man says that the two seem to get along. Keep in mind this cheat will only work if the girl maril is holding sea incence. Then, and only then, will you be able the hatch an azuril.
-Hpoe this helps