I know RNG can solo Zipacna if nobody is in sky to steal your mob just by going RNG/WHM and zone, dia, zone, shoot, repeat... for an hour.
I find this hard to believe, Dia 1 has a pretty piddly duration and Dia 2 costs significant MP. Zipacna has
25%(37% maybe?) movement speed and will get a hit off as you zone if you shoot, or 2 hits if you dia(excluding double attacks), hits relatively hard, and runs back fast so you can't even zone in while it's still near zone. Are you claiming to have personally done this, or do you have any proof?