Ice Punch has some illegality issues, however. I always prefer my Toxicroak to run a set of Swords Dance(or Bulk Up) / Drain Punch / Sucker Punch / Substitute. With a sub up most opponents will be forced into attacking and then you hit them with a +2 LO Sucker Punch in the rain (as to nullify the LO damage), then you just rock face. I ran double Sucker Punch users in Bisharp and Toxicroak and that was pretty awesome actually. Since with Bisharp Taunting users into attacking makes Sucker Punch pretty awesome overall.
Plus Dark / Fighting is hella awesome type coverage