Only a couple should breed. I'm talking about legendaries like Heatran and Shaymin who aren't actually that rare in the game universe.
I think this hasn't been mentioned yet, but they have no gender.
Manaphy can already do that, but it would be really cool to have that apply to some other legendaries as well. Perhaps the reasoning for that could be that it takes incredibly long for these "baby" legends to evolve or "grow" into their final forms. So that it wouldn't happen within the course of the game (or, possibly, a human lifespan).
Whoa, wait. Shaymin's not rare? Then tell me why I don't have one.
Heatran, Latios, Latias, Cresselia, Kami trio...those all have a gender. :x
I think those with a gender should be allowed to breed, especially awesome Heatran, which can be either male or female anyway. Why make it that way if it can't breed?
I also don't think that Legis should be able to breed.
For pretty much the same reason as above - it would kill their uniqueness. Of course there are several of them since people can trade etc.
But for most legendarys.. as far as I understood it from the actual Pokemon story... there only exists one anyway.
The only thing I would like would be if they had genders like Heatran, Latias, Latios etc :3
I see no reason why any Pokemon should be genderless. Some like Magnemite are genderless due to being more mechanic? Well there are some Pokemon out there that look much less "animalistic" and still have genders ._. I think all should have. u.u
a random Pokémon hatched. that's be mint.