I know that Naganadel (who is released now) and Melmetal are genderless, Pikachu is obviously male. Rowlet was stated to be male but only in the dub so that doesn’t count. So with those being mentioned what gender are Ash’s Sun and Moon Pokémon?
Rowlet: Male Lycanroc: Male Litten/Torracat/Incineroar: Male Naganadel: Genderless Melmetal: Genderless
Source
Hope I helped!