>>31758937If we're talking tangentially canon, anything with an assigned gender has easily recognizable genital structure.
Cresselia, Heatran, Aegislash, Genies, Lati@s, all easily visible. The dick is right there for anyone to see, it's just not shown cause 'banned from tv.'
Meanwhile, Lunas and Solgaleo, while they are known to be the male and female equivalents, are categorized as "gender unknown" because they can't find the lion's dick. They know it's there somewhere. But no idea where it is or what it looks like. Must reproduce in weird ways, like most Legends.