I didnt get stories mixed up.. Just telling them a different way :)
In Mythology of Pokemon (NOT TRUE IN RL)
Mew gives birth to Mewtwo
Mewtwo marries Mew
Mew and Mewtwo have 12 Children (Suicune, Articuno, Zapdos, Raikou, Entei, Moltres, Regirock, Regice, Registeel, Jirachi, Deoxys Down, and Celebi)
Suicune and Articuno Marry, Zapdos and Raikou, as well as Entei and Moltres Marry. Regice marries Registeel, Regirock is virgined, Celebi is virgined, Deoxys is virgined, and Jirachi is not married to anyone yet.
Mewtwo is Banished as a bad father, and from him comes Aerodactyl and Ho-Oh and Lugia.
Kyorge is Born, Groudon is Born, They both marry (Mother Sea, Father Earth)
Latios is Born, Latias is Born (Sky Father, Sky Empress (not married)