Registeel, the Iron Pokémon. Its body is harder than any metal found upon this planet. Its body is also hollow, and its food source remains a mystery.
– May’s Pokedex
Registeel is one of the Golems in Gen III. Unlike the other Golems, who are sharp and jagged, Registeel is nice and smooth, perhaps to look futuristic compared to the other two. It’s the first Steel type legendary, and still the only pure Steel legendary.
Stat-wise, it has massive Defense and Sp Defense, but in exchange, its other stats are rather average. It’s slow, as it appears. Its Attack and Sp Attack are the same, and it can learn a mix of physical and special moves.