You go to Fuego ironworks then use the poke radar there and it should appear in the grass.
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Aron evolves into Lairon at level 32.
You can find Aron only in Diamond.
fuego ironwoks (use poke radar)
Lairon thrive in the Safari Zone. Breed to get Aron.
You have a 1/8000 chances to see any shiny Pokemon find an area where you can find Aron alot and wait until its shiny then catch it.