>>48942240>Anon, there's almost zero connection in that regard.Both have established royalty in canon that play major roles in the plot and lore.
Both have locations that pay homage to Reshiram and Zekrom.
Both deal with the concept of Pokemon being forces of nature/death as with Kyurem eating people and Yveltal taking life in order to use as its own energy
>Also don't forget that gen 5 only had one mega in the entirety of gen 6.Unova marks the debut of Mega Evolution in the anime and Kalos marks its debut in the games, despite this-- XY features no Gen 5 or 6 megas because they were the newest regions and Mega Evolutions were strictly for older Pokemon. So of course Unova didn't get any, and neither did Kalos.