once you beat the fire gym leader may comes and gives you goggles to be able to go in the desert. once you get in the desert if you see a tower of sand go in it. oh and bring repel if your Pokemon are weak because the tranpinch are kinda strong. once you get to the top you'll see two fossils the one on the left is anorith.
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You get Anorith from a certain Pokemon fossil.
If you want an anorith in Pokemon diamond, you have to migrate it from Pokemon ruby, sapphire, or emerald. I used to have Pokemon diamond and Pokemon emerald and I would migrate Pokemon all the time. You have to beat the elite four first, then you will be able to go to pal park. Anorith evolves into Armaldo at level 40.
level 20, as with all fossils in all games
In the dessert there are 2 fossils at the very back on the right. One is a plant fossil and that will give you lileep the other will give you anorith. Take the fossil you chose back to rustboro city and talk to the guy on the second floor and he will bring it back to life.
Anorith cannot evolve with a stone, it evolves at level 40