>>34453936>Are there more than one of each?Yes, confirmed multiple times.
>How the fuck does that work if so?How does it not work? There's nothing in the games that imply they are unique beyond the fact that you can only get one.
>Legendary Pokémon often have world-rending or terrible powers, so is it still okay for some random trainer to have them?Depends on the Pokemon. Shit like Latios and Darkrai have nothing even approaching world-ending powers.
It was also mentioned in the DP games that Dialga and Palkia's powers had to be contained before they could be captured, so even there you're not running around with anything capable of warping time and space.
Also, "hard regulating" Pokemon that it's unclear to the world if even exist at all, and which Trainers in general aren't going to have makes no sense from a storytelling perspective. The games have that shit because it's a video game and everyone playing them are going to end up catching these things.
It's like the NFL having hard regulations against specific mutant genes that could potentially maybe exist.