Steel Type

Steel Type Pokémon are introduced in Generation 2. Steel Type Pokémon characteristics are as follows:

STEEL
-Super Effective Against: Ice & Rock
-Weakness: Fire, Fighting, & Ground
-Resistance: Normal, Grass, Ice, Flying, Psychic, Bug, Rock, Ghost, Dragon, Dark, & Steel
-Immunity: Poison

 There is only one set of Pokémon in Second Generation that changes it's type. Magnemite and Magneton still keep Electric as their first type, but gain the Steel type as their secondary type.

There are 4 brand new Steel Type Pokémon that are introduced in Generation 2:

 

Forretress

Bug/Steel

(Evolves from Pineco)

Skarmory

Steel/Flying

 

Scizor

Bug/Steel

(Evolves from Scyther)

Steelix

Steel/Ground

(Evolves from Onix)