I think the Physical set is outclassed by a mixed set like this:
move 1: Psychic
move 2: Sucker Punch
move 3: Drill Peck / Pluck
move 4: Heat Wave
ability: Early Bird
evs: 196 Atk / 116 SpA / 196 Spe
This gives Natu 15 in each attacking stat and an easy way to deal with Bronzor. Natu isn't surviving anything anyway without Screens.
Also, I think Early Bird is completely viable in this metagame with Hypnosis Meowth and Gastly, Spore Paras and Shroomish, and a bunch of Sleep Powder mons. Other status is less common, especially since essentially the only other status is burn from Misdreavus who Natu has no business switching into.
f u, v