just something about my zinnia comment, why not have her unlock post-game if you have every dragon type legendary and the draco plate for arceus and the dragon memory for sylvally. Another thing is after necrozma you can get ultra necrozma to upgrd necrozma, thus making another dragon to help the mc seduce zinnia
Viewing post in The Legendary Pokemon Breeder comments
Btw since rayquaza developed the organ that lead to x and y forms rayquaza is the ancestor of charizard, and mewtwo probably got dna from her, so maybe there could be an event after she gives birth on the boat to (or away from) kalos where she reveals that mewtwo is not just "Twosie" but also a clone of the sky dragoness herself. i saw the post about rayquaza giving mewtwo her mega stone (presumably after doing some offscreen mining in the thermosphere) and i think that was a great idea!