The only Pokémon that come to mind with noticeable stat differences based on gender are Nidoking and Nidoqueen, which are actually different species. (Nidoking has more punch, Nidoqueen is more bulky.) Other Pokémon with different forms for male and female, such as Meowstic and Unfezant, are otherwise identical. Gender occasionally influences evolutions, for example Gallade and Vespiquen. But there is no difference in base stats.