>>49620492It's *not* "canon" that people used to marry Pokemon. It's a hazy line of text with nothing else behind it, there's no in-game event to correlate what it says and the text itself is very vague. The only context we get is that it's a piece of text from a book about folk tales, there's no in-game event vindicating it like some other texts found in that library.
As for the other bits I will always tell people to watch other media than Pokemon. Everything you listed is fairly common in other media. No need to think Pokemon is a special case, and as I already pointed out among some of the other monster franchises it actually stand out as not having talking monsters aside from very few special cases such as Meowth in the anime or the Rotom using electronics to talk or one offs from species that are never seen talking again. SMT, Digimon, Yokai Watch, even Monster Rancher had them too at least in the anime.
As I've made it clear it's all very deliberate actions by Pokemon itself to paint the Pokemon in a certain light. The games show that at best most Pokemon can only say a single word, and even the most intelligent of them can barely string a coherent message together such as the oranguru telling you "Gu do it!".
