you have to get lairon toLV. 42 OR 43 and then Lairon will evolve into Aggron
It can evolve at level 32 into a Lairon. Then Lairon will evolve into Aggron at level 42
Lairon evolves at level 42-45
Lairon evolves at level 42-45 in Pokemon Emerald version.
25
Get Lairon To Lv42 and it will evolve into Aggron
it envolves into lairon then into aggron
42
Aron-->Lairon-->Aggron
25
Your Aron will evolve at level 32 into Lairon.
This Pokemon evolves at level 42...