Gunk Shot is 120. Iron Tail is 100. Iron Head is 80. Saying poison and steel moves will still be useless in gen 6's meta(assuming Fairy is true) is like saying Donphan has no use for Ice Shard, or Cloyster with Rock Blast. Screw STAB, if it's SE it's gonna hurt.
There's also sludge bomb with 100 accuracy and 90 power that can be learned by a lot of pokemon including Gengar and Landorus in the OU tier.
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