How to Evolve Lairon

Lairon evolves into Aggron exactly at level 42. There are no secondary conditions attached to this evolution.

Players do not need to use a Metal Coat, trade the Pokémon, or wait for a specific time of day. Reaching the required level through standard battle experience, Rare Candies, or EXP Candies will instantly trigger the evolution screen.

For players raising this evolutionary line from the base stage, Aron evolves into Lairon at level 32. This means you must grind Lairon for 10 levels before unlocking its final form.

Aggron earns a solid 6/10 rating for standard playthroughs and competitive lower tiers. It functions primarily as a physical wallbreaker or a dedicated physical wall.

Its base 180 Defense allows it to shrug off almost any physical neutral hit. Combined with a base 110 Attack, Aggron hits back hard without needing setup moves.

However, its base 50 Speed and 60 Special Defense severely limit its viability in higher competitive tiers. Special attackers will easily outspeed and OHKO Aggron with moderate neutral hits.

The Rock/Steel typing provides a polarizing defensive profile. Aggron boasts nine resistances and a full immunity to Poison-type attacks.

Flying, Normal, and Bug-type moves deal negligible damage against its massive physical bulk. This makes Aggron an excellent pivot against specific physical threats.

The critical flaw lies in its 4x weaknesses to Ground and Fighting-type moves. Common competitive staples like Earthquake and Close Combat will instantly knock out a standard Aggron, bypassing its 180 Defense entirely.

Aggron’s viability heavily relies on its ability. Rock Head is the preferred choice for offensive sets.

Rock Head negates recoil damage, allowing Aggron to freely spam Head Smash. A base 150 power Rock-type move coming off 110 Attack with Same Type Attack Bonus (STAB) breaks through most defensive cores.

Sturdy offers a defensive alternative, guaranteeing Aggron survives any single attack from full HP. This pairs perfectly with Metal Burst, allowing Aggron to reflect 1.5x the damage taken back at the attacker.

In formats allowing Mega Evolution (Generations 6 and 7), Mega Aggron shifts to a pure Steel typing. This eliminates the crippling 4x weaknesses to Ground and Fighting.

Mega Aggron gains the Filter ability, which reduces super-effective damage by 25%. Coupled with a staggering base 230 Defense, it becomes nearly impossible to break on the physical side.

This form elevates Aggron to an 8/10 competitive rating. It serves as one of the premier physical tanks in National Dex formats, checking prominent physical sweepers effortlessly.

Aggron fits best on Trick Room teams where its base 50 Speed becomes an asset. It is ideal for players who need a dedicated physical sponge to absorb Normal and Flying attacks.

Players running hyper-offense teams should avoid Aggron. It drains momentum due to its low speed and reliance on predicting opponent switches.

If your team already struggles against Ground-type users like Garchomp or Landorus, adding Aggron will compound that weakness. Pair it with Flying-types or Levitate users to cover its glaring Earthquake vulnerability.