Aron evolves into Lairon at lvl 32 and will evolve again into Aggron at lvl 42, so no stone is needed.
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Your Aron will evolve at level 32 into Lairon.
Aron evolves at level 32.
Aron-->Lairon-->Aggron
Aron will most likely evolve at level 23 unless paralyzed
aron evolves at 22 or 23 and possibly 33