Aron evolves into Lairon, and Lairon evolves into Aggron: the full line is Aron → Lairon → Aggron. The species are National Pokédex numbers #304, #305 and #306, respectively. The exact level triggers depend on the game version, and the official general guidance does not give Aron’s specific thresholds.
What does Aron evolve into?
Aron’s evolution line has three species: Aron becomes Lairon, then Lairon becomes Aggron. The official Pokémon TCG checklist confirms the relationships by identifying Lairon as evolving from Aron and Aggron as evolving from Lairon. The official Pokédex search listing assigns them numbers #304, #305 and #306, in that order.
What level does Aron evolve?
There is no single level threshold established here for every Pokémon game. Pokémon’s general game guidance explains that some Pokémon evolve when they level up, while others evolve through different methods; it does not specify Aron’s trigger or levels. Check the Pokédex or in-game guidance for the particular title you are playing rather than assuming one set of thresholds applies across versions. Pokémon’s general evolution guidance
The often-repeated claim that Aron evolves at level 32 and Lairon at level 42 appears in an article that also contains unrelated material. Those numbers are not independently verified by the official general guidance, so they should not be treated as confirmed for your game without version-specific support.
How do you get Aggron?
Follow the evolution line in the game you are playing: obtain Aron, evolve it into Lairon, then evolve Lairon into Aggron using that title’s stated trigger. Since the specific triggers are not established across versions here, use the relevant game’s own Pokédex or evolution information to confirm the required level or other condition.
Aron, Lairon and Aggron in the Pokémon TCG
The same species line appears on Pokémon cards. The official checklist classifies Lairon as a Stage 1 Metal Pokémon evolving from Aron, and Aggron as a Stage 2 Pokémon evolving from Lairon. Those are trading-card game designations; they do not establish video-game evolution levels, stats, moves or mechanics. Official Pokémon TCG card checklist
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