>>35114821Legendaries and Mythicals are not plentiful, so you cant examine them as a group to determine what is and isn't a sexual organ. Also, they can't breed. Manaphy does not count
Ultra Beasts are plentiful, but they're from timelines where completely different evolutionary environments occured. If they did have a gender, it would take earth-levels of historical research and experiments to even figure it out. Also, they can't breed.
Inanimate objects don't have a gender because they are not biological creatures. Some CAN breed, but only with Ditto.
Gender is not determined by only what does and doesn't look masculine or feminine. This answer all of your questions and concerns, Anon?