Given the many duplicate Pokemon (and shinies) GameFreak throws our way. I sometimes like to have people with different movesets to set themselves apart from something I already caught/trained a generation ago and can transfer over.
I know Greninja is usually a special attack, but Ash-Greninja has the option of using physical moves too (just not as many). Even Toxtricity has been used as a physical attack, and then there's Rayquaza.
So how many equal-offense Pokemon are there? I can't find this information on Bulbapedia or Serebii without looking at every last individual Pokemon out there.