i dont know how but i got items when i met boaba and show him a sandshrew he'll give you items to use in the safari zone.
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Water objects draw out certain Pokemon from the safari zone. They are: puddle, fountain and water hole.
you can get it in safari zone when you are able to lay down objects. place 28 rocky objects in the desert zone for it to spawn in the grass. (may take a couple of days)
In the Safari Zone (Rocky Beach) with 13 Plains objects and 17 Peak objects (and waiting 100 days).
After you get the Nationl Dex you can catch him in the Safari Zone after placing 50 objects.
in safari zone.. look up on youtube -Just so you can keep from searching, put 19 objects in the 'forest' area in the Safari Zone, then run around. You'l find him eventually! :D