Yea, thanks for catching that, Aasgier. Not every Regirock carries Drain Punch, but the player should use it if it does.
That said, I would propose Zangoose moving down to A-rank for the simple fact that I don't understand why it's S-rank. I've played an astounding number of 2 Zangoose in my total of 20+ games in NU, and it has done nothing but die. I don't understand how a mon who is hardly used could possibly be S-ranked.
an argument based on a pokemons usage is invalid, altough i agree with zangoose going to A rank. this topic is to determine the viability
of a pokemon in NU, usage has got little to say about the pokemon itself but the popularity.