>>29007019>moonblastGamefreak isn't that blind. It doesn't learn that.
>>29006941Aura Sphere hits both Rock- and Steel-types that otherwise resist Air Slash (and you should never stay in on Electric-types anyway since they can't be paralyzed).
If it got Earth Power, that would be ideal since it would also hit Electric-types and Poison-types.
Another option is Nasty Plot, but I'm not a fan of mono-attacking sets.