It does not learn dig through the leveling process. You will need to use a TM. Look for the fossil maniac's brother on I believe route 141.
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Aron evolves into Lairon at Level 27 in Pokémon Ruby.
Aron evolves at level 32.
I know that Pikachu can learn dig. I also think it's true that Aron can learn dig. I hope I helped you!
Level 25.
level 5