You can't
Its impossible, legendary Pokemon are unable to reproduce.
Every living thing has a way to reproduce. The 'genderless' tag on Pokemon in the games is to prevent players from breeding legendary Pokemon. That way, unless you traded (or cheated), you could not have more than one as it would contradict with the game lore. However, even in the anime it is shown that legendary Pokemon have the ability to reproduce and have young.
Unfortunatley.. they cannot because Heatran is a legendary. The GameFreak creators made it so you cant reproduce legendary pokemon. But, it would be fun to have an army of them:)
It is a rare pokemon, but it is not a legendary pokemon
Unknown is not a legendary Pokemon but it is considered rare. Legendary Pokemon are one of a kinds.
no lileep is not a legendary pokemon but it is an ancient pokemon
The legendary is palkia
No, snover is not a Legendary Pokemon
No, Blastoise is not a legendary pokemon.
Is sawk a legendary pokemon??
Noivern is not a Legendary Pokemon.
Azelf is a legendary Pokemon.