What do you think of the theory that claims all pokemon originally came to our world from space?

That depends on your definition of “originally,” your view of legendaries, and whether or not you’d like to be part correct.

First and foremost, if you believe in Sinnohan legend and if you consider legendaries to be progenitors of the Kingdom Pokémonica, Arceus, creator of the universe, would have technically come from space, as Earth didn’t exist when it came into being. As all pokémon are, according to this same legend, descended from Arceus, it stands to reason that pokémon as a whole have extraterrestrial origins on a distant level.

However, if you don’t believe in these legends and if you don’t wish to be rather smart about it, there is strong evidence supporting the idea that the earliest members of certain pokémon came from space. For example, lunatone and solrock are composed of minerals that are identical to those of meteorites, and the composition of the beldum line strongly resemble that of asteroids. Additionally, there is historical evidence that other, flesh-based pokémon such as the elgyem and clefairy lines may have ridden meteors to Earth.

But to say that all pokémon came from space may be a bit absurd, especially if you don’t subscribe to the idea that all pokémon were created by the legendaries. There are some pokémon that simply cannot have come from space, as nothing in either their physiology or behavior suggests that they have.

That and, well, humans were responsible for the creation of quite a few pokémon, so it’d be unfair to say they were ever extraterrestrial.

…unless you believe humans are aliens. Which actually is a rather interesting theory with stronger evidence to back it up than the idea that every single pokémon came from another world.