You will have to find a Pokemon that meets these requirements:
- Is on this list.
- Has an Adamant Nature.
- Has male as their gender.
Now, give this Pokemon an Everstone.
Done that? Now, you will need to find a female Pawniard. It just has to be female, it doesn't have to meet any requirements.
Once you have these two Pokemon, put them in the daycare, and wait for an egg.
Hatch the egg, and voila: an Adamant-natured Pawniard! Of course, you will have to train it from Level 1, but unless you want to keep searching in the grass, this method is sure to work.
Hope I helped. :)