Steel

Attack
Steel type moves are super effective against Ice, Rock, and Fairy-type

Steel type moves are not very effective against Poison, Fire, Water, Electric and Steel type

Defense
Poison-type has no effect against Steel-type pokemon

Normal, Grass, Ice, Flying, Psychic, Bug, Rock, Dragon, Steel and Fairy-type are not very effective against Steel type

Fire, Fighting and Ground types are super effective against Steel type

All Steel Type Pokemon
Magnemite

Magneton

Forretress

Steelix

Scizor

Skarmory

Mawile

Aron

Lairon

Aggron

Beldum

Metang

Metagross

Registeel

Jirachi

Empoleon

Shieldon

Bastiodon

Wormadam

Bronzor

Bronzong

Lucario

Magnezone

Probopass

Dialga

Heatran

Excadrill

Escavalier

Ferroseed

Ferrothorn

Klink

Klang

Klinklang

Pawniard

Bisharp

Durant

Cobalion

Genesect

Honedge

Doublade

Aegislash

Klefki

Togedemaru

Solgaleo

Celesteela

Kartana

Magearna