Futari wa Pretty Cure is available to watch on Crunchyroll for free! Knowing Crunchyroll, I'm not sure if it's available in every country. If it's not available in your country, feel free to watch it here! If it is, I implore you to watch it there, or on some other legal streaming service, because it's on multiple. I know ads are annoying, but supporting the show tells Toei that English speakers are interested in the franchise, and that they should do more with it over here.