Okay, I just learned about a certain plot point regarding the Ultra Beasts that is extremely dark.

Not going to spoil what it is, exactly, but you thought Black and White were dark? This is Mystery Dungeon levels of dark, at least!

I agree. I beat the game about an hour ago, and I must say there are a lot of darker themes. I love how the Pokémon company is taking this turn, and I can't wait to see where it goes.