Lairon will evolve into Aggron once it has reached level 42.
If you find a wild lairon in the wild at level 44 it will evolve whenever you level it up again.
-gamerhelperz
It can evolve at level 32 into a Lairon. Then Lairon will evolve into Aggron at level 42
Lairon will evolve once it hits Level 42.
aron evolves into lairon at level 32 and then to aggron at level 44
Lairon evolves into Aggron at level 42.
Lairon evolves into Aggron starting at level 42.
42(:
it evolves at level 32 into lairon, then level 42 lairon in aggron.
Lairon evolves into an Aggron at level 42.
Lairon evolves at level 42-45
it evolve at lv 43
Lairon will evolve to Aggron at level 42.
Aron evolves into Lairon at Level 32. Lairon evolves to Aggron at level 42.