Why are the genders of most legendary/mythical Pokemon unknown?

It has always bothered me that people call some Pokemon “gender-less,” because it just isn’t canon. In every pokedex entry, Pokemon book, and any other official resource has listed them as gender unknown. This implies they have a gender, they just haven’t been identified. (Because Pokemon are clearly not void beings)So, what is it:do they have genders, or don’t they?

The difficult part is if they did, why haven’t they been identified? This could be chalked up to the scientists never seen them breed or anything, or in legendary’s/mythical’s case, could be that they are infertile. Then, why are lati@s and others gendered? They are not the only ones referred to as being clearly one gender and not the other.

Please try to usecanonreasoning. Thank you!

Pleaselog inorregisterto add a comment.

I think it’s more like they can’t breed, or like you said for the legendaries, they’re infertile. The only reason they can ‘breed’ with ditto is because they aren’t ‘breeding’ the ditto is just making a copy of their species' DNA (of course, not perfectly the one that’s in the Daycare with them, or else using on as a parent for competitive wouldn’t work). As for Latias and Latios, maybe they are the same ‘species’ just with a massive difference between genders, like Nidoking/Nidoqueen, and can’t breed, again like Nidoqueen. With Cresselia, I really don’t know. Heatran can be male or female, and I don’t see any reason (other then it being a legendary) that it can’t breed. I hope this was good, I kinda got a bit of topic. Also, I think it should be noted that in the show, all Pokemon are called ‘it’, so maybe it’s really difficult to tell a Pokemon’s gender? But that wouldn’t work with the games.

my friend checked in an email a while back to the Pokemon company. they have confirmed every Pokemon has a gender but its hard to tell what their gender is. this is why they don’t show the gender