Aron evolves at Level 32 in Pokémon Emerald.
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Lairon (Aron's evolved form) evolves into Aggron at level 42.
Aron-->Lairon-->Aggron
Find any double battlers in the region and have aron hold exp share send out aron and a really strong Pokemon beat the trainers and aron will level up quickly repeat until it evolves.
The Pokemon Aron evolves into Lairon starting at level 32 and Lairon evolves into Aggron starting at level 42.