Aron, the Iron Armor Pokémon. Aron has an impressive defense power and eats iron ore in order to build up the metal in its body.
– Ash’s Pokedex
Aron is the first Steel/Rock type Pokemon. Despite it having lots of resistances, including doubly resistant to Normal, it also has double weaknesses to both Fighting and Ground.
Even though it’s part Rock, it doesn’t learn any Rock moves by level-up (it does by TM and breeding though). I think it should be pure Steel instead, because it has more Steel characteristics (reminds me of armor).
Stat-wise, it has tonnes of Defense, decent Attack, and not much else.