Megas would fit very well into Sinnoh though
>Professor Rowan studies Pokemon Evolution
>Professor Sycamore studied under Rowan and came to Kalos to study Mega Evolution
>Dialga, Palkia, Giratina, and Arecus are literally the gods of the Pokemon word and should have Megas/Primals to make them the most powerful legendary Pokemon like they are in the lore