Steel (type)

The Steel-type is one of the eighteen official Pokémon Types. Although there are no notable Trainers who specialize in Steel-type Pokémon, there are some that have Steel-type Pokémon in their parties. These include: Rick (from the battle in Docking Port onward if you chose the Teeth Fossil in Goldune Cave, or from the battle on Route 16 onward regardless of your chosen Fossil), and Commander Brite and Leader Starla of Team Solar.

Pokémon
There are 17 Steel-type Pokémon, which is 4.75% of all Pokémon (not counting forms).

Trivia

 * The Steel-type is the best Type defensively in Pokémon under normal battle conditions, having a total of 10 resistances and an immunity to Poison (it used to resist Ghost and Dark prior to Gen 6, although Steel does resist those Types in this game, as you can see in the Type Effectiveness chart above). However, if Inverse Battle rules apply (although there are no Inverse Battles in Solar Light and Lunar Dark), then that would make Steel the worst Type defensively.