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Warning: Extremely autistic thread
Steel types being immune to Poison attacks makes no sense and is completely inconsistent with the rest of the game.
I'm not talking about the poison status, just poison attacks. For the most part it's reasonable for Steel-types to be immune to internal, biological damage (though why certain pokemon like Skarmory or Forretress are immune is questionable at best).
However, most poison attacks don't just rely on toxins to deliver their damage. Sludge/Sludge Bomb and Gunk Shot are projectile attacks much the same as things like Water Gun or Fire Blast. Cross Poison/Poison Jab etc are physical hits with an elemental typing added to them. I can see Smog and maybe Venoshock not working at all but I refuse to accept that if you Mega Punch a steel wall it takes a reduced hit, but adding the poison element somehow makes it do ZERO FUCKING DAMAGE. These attacks should be NOT VERY EFFECTIVE against the Steel type.