Against pure steel Pokémon (like Mawile), Fire-, Fighting- and Ground-type moves have the strongest effect at 200%
However, Steel-types are resistant (50%) to Normal-, Grass-, Ice-, Flying-, Psychic-, Bug-, Rock-, Ghost-, Dragon-, Dark-, and Steel-types.
They receive no damage from Poison-types.
Water- and Electric-type attacks inflict normal damage.
Steel is super effective against rock type pokemon.
Steel type Pokemon is super effective against: Ground, Fire, Fighting Steel type Pokemon are not effective against: Bug, Flying, Psychic, Ghost, Dark, Steel, Dragon, Grass, Normal, Ice, Rock. Steel type Pokemon are never effective by: Poison. Steel type Pokemon have a regular damage by (regular damage): Electric, Water. Hope this helps!
Fire and steel types are super effective against Ice Pokemon. Electric, although super effective against water, do only normal damage to Ice Pokemon
Flying type moves are super-effective against grass, bug, and fighting Pokemon. However, they are only half-as-effective against electric, rock, and steel Pokemon.
Steel type Pokemon are weak against fire, fighting, and ground types. So if you want to defeat a steel type Pokemon or catch one, make sure you use super-effective moves that are weak against steel type Pokemon.
Steel is super effective against rock type pokemon.
water
Steel type Pokemon is super effective against: Ground, Fire, Fighting Steel type Pokemon are not effective against: Bug, Flying, Psychic, Ghost, Dark, Steel, Dragon, Grass, Normal, Ice, Rock. Steel type Pokemon are never effective by: Poison. Steel type Pokemon have a regular damage by (regular damage): Electric, Water. Hope this helps!
Dark, Steel
Flying type moves are super-effective against grass, bug, and fighting Pokemon. However, they are only half-as-effective against electric, rock, and steel Pokemon.
Fire and steel types are super effective against Ice Pokemon. Electric, although super effective against water, do only normal damage to Ice Pokemon
Fighting and Ground type moves are super-effective against steel type pokemon.
Fire and fighting type moves are super effective against Ice type pokemon.
Fire, fighting, steel and rock
Steel type Pokemon are weak against fire, fighting, and ground types. So if you want to defeat a steel type Pokemon or catch one, make sure you use super-effective moves that are weak against steel type Pokemon.
Ice, Electric and steel.
Water Pokemon. You can also use rock Pokemon such as geodude or onix. Do not use grass or steel Pokemon these types are week against fire.