Aggron

An armored dinosaur, the kind children’s books draw with plates along its back and horns over its skull, run through the filter of a Japanese movie monster. Its official category, the Iron Armor Pokémon, describes what you see: 2.1 meters and 360 kilos of metal plates fitted onto a bipedal creature that walks leaning forwards.

The Pokédex entries all insist on the same thing: territory. It claims an entire mountain, patrols it without rest and takes down anything that puts it in danger. Its scars work like a résumé: the more it has, the more fights it has been through. And there’s one detail that doesn’t fit its brute reputation—if a landslide or wildfire destroys its mountain, it carries in new soil, plants trees and rebuilds the terrain.

It eats iron. It digs tunnels through rock with its steel horns while searching for ore, and those same horns can pierce thick iron plates. Another entry recalls an ancient monarch who had a helmet made in its image so that it would lend him strength.

It completes the Aron and Lairon line, and it does so late: forty-two levels of waiting for the one that started out as the smallest creature of the three.

The stat spread is one of the most lopsided around. 180 Defense against 60 Special Defense, with 70 HP doing nothing to help either; a decent 110 Attack, a surplus 60 Special Attack, and 50 Speed that leave it moving last almost every time. A massive physical wall built on a short-lived HP base.

Steel and Rock give it eleven resistances and an immunity to Poison, the best defensive tally in the game on paper. Paper doesn’t last long: Fighting and Ground hit for four times damage, Water for twice, and all three are everywhere. Sturdy guarantees that it survives one hit from full health, which against those weaknesses is less a safety net than a free extra turn. Rock Head is the ability that really changes anything, because it cancels the recoil from Take Down (level 40) and Double-Edge (level 80), and 120 power with no drawback is nothing to sneeze at on a physical attacker. Heavy Metal, its hidden ability, doubles its weight and boosts Heavy Slam (level 72), whose power comes from comparing the two Pokémon’s weights.

Offensively, it learns Iron Head at 28, Iron Tail at 56 and Stone Edge by TM. With Iron Defense (level 64) and a Hard Stone, the item it can hold in the wild, it can take quite a beating.

In a normal playthrough, it’s a comfortable plug against any physical team that isn’t Fighting- or Ground-type, and its EV yield is 3 Defense. Mega Evolution changes the premise: it loses the Rock typing, becomes pure Steel and gains Filter, which cuts the damage from super-effective hits.

Monster Egg Group, the one for large reptiles, and a 50% gender split, so breeding doesn’t depend on getting lucky with the sex. Its 35 incubation cycles are among the longer ones: about 9180 steps using the usual (cycles + 1) × 255 calculation, almost twice as much as most three-stage lines. The data file assigns it no Egg Moves of its own, which makes sense: breeding is done with Aron, and anything inherited comes from there.

Evolution doesn’t require anything unusual, just patience. Aron evolves into Lairon at level 32 and Lairon into Aggron at 42, with no items, no time-of-day requirements and no friendship. With a Slow growth rate, those levels arrive later than the numbers suggest, and anyone who wants the final form before the end of the game has to put it through some serious battles.

Its habitat is the mountains, consistent with the entries. Its catch rate is 45, the number for difficult Pokémon: a Poké Ball at full health almost never does the job, so it’s best to lower its health and put it to sleep. Its base friendship of 35 is below average, another trait shared by species the game considers surly.