..Even if in-game they're genderless, Theres some bits of proof.
In the Pocket guide It says "Unkown gender" unstead of genderless with "Not discovered" as Egg type..
ANd List of Legendaries with genders(List of ones I know of)
Mew(Female?)
Lugia(Male&Female, Theres a baby in the movie)
Ho-oh(Male&Female, Theres multiple Lugia, Why not Ho-oh?)
Celebi: Female(PMD2's Celebi is Female)
Kyogre:Male(Pokedex says KING of the sea)
Groudon:Male(Pretty much common sense)
Rayquaza:Male(I would guess so.)
Jirachi:Male?
Uxie:Male(Just what I think)
Mesprit:Female(PMD2 proves it.)
Azelf:Male(Just my opinion)
Dialga:Male(It's footprint is that of a king's crown)
Palkia:Female(It's footprint is that of a queen's crown)
Giratina:Male(It's footprint is that of a prince's crown)
Arceus: Both.
But it's just what I think. No big deal.
In the Pocket guide It says "Unkown gender" unstead of genderless with "Not discovered" as Egg type..
ANd List of Legendaries with genders(List of ones I know of)
Mew(Female?)
Lugia(Male&Female, Theres a baby in the movie)
Ho-oh(Male&Female, Theres multiple Lugia, Why not Ho-oh?)
Celebi: Female(PMD2's Celebi is Female)
Kyogre:Male(Pokedex says KING of the sea)
Groudon:Male(Pretty much common sense)
Rayquaza:Male(I would guess so.)
Jirachi:Male?
Uxie:Male(Just what I think)
Mesprit:Female(PMD2 proves it.)
Azelf:Male(Just my opinion)
Dialga:Male(It's footprint is that of a king's crown)
Palkia:Female(It's footprint is that of a queen's crown)
Giratina:Male(It's footprint is that of a prince's crown)
Arceus: Both.
But it's just what I think. No big deal.