The Steel Type first appeared in Generation II. Steel Types have a hardy reputation for their resilient nature and exceptional Defense and Special Defense stats. It is the most defensively-inclined type, boasting a resistance to 11 of the 17 types and an invaluable immunity to the Poison Type. However since Generation VI, its resistances decreased to 10 of the 18 types; gaining an advantage over the Fairy Type and losing resistance to the Ghost and Dark Type.
This table represents how a Steel-Type matches up against other types of Pokémon. The second type of a dual-type Pokémon can really determine the matchup, sometimes leaving only a few weakness.
List of Steel-Type Pokémon
List of Steel-Type Moves
List of Steel-Type Z Moves
Related Threadswhat are steel pokemon weak against? - last post by @ Apr 25, 2010
Why there is no Dark/Steel combo type Pokemon? - last post by @ Jun 29, 2010
You know, after seeing Mega Mawile and Mawile's Fairy/Steel typing... - last post by @ Nov 23, 2013
Steel too strong, Poison too weak. - last post by @ Jul 6, 2003
Steel type: Unintentionally nerfed? - last post by @ Mar 26, 2014