Sex between the Races Lore?

[kujoestars]

The thing is, that happens at an individual level, and resets with every generation. It's like Pokémon evolution - a dragonet becomes a dragon, the dragon becomes a wyrm, the wyrm lays an egg... and what hatches from the egg is a dragonet, not a baby wyrm.

That is true, though if the offspring stays in the same region that would result in the same form repeatedly, or alternately if the aether changes to yet another unique imbalance. And for a little wild speculation, what if even within known patterns mutations happen? The thrown in any possible hybridization with man so forms become more fixed.

Back on just dragon themselves though: Your Pokemon analogy has me grinning at the thought of "Alolan Form" dragons. XD

[Cybylt]

That is true, though if the offspring stays in the same region that would result in the same form repeatedly

That is not the case in the dragons of Dravania, who predominantly live in the same area yet show a variety of forms even several flightless varieties in the floating islands of the churning mist. Weather patterns over their lifetime as well as personal habits are going to change the balance of aether they're going to take in. A dragon that spends more time in flight is going to get more wind aether than one that spends time on land which is put forward as how we get Wyverns and Lesser Dragons.