Giratina is a legendary dragon Pokémon, heavily connected to death and transcendence through dimensions in this world's mythology. At least, that's what I've read.

[ He flips to the relevant page in his dragon book and passes it over, which doesn't go into all that much detail but goes over the basics. ]

Mm. Your ideas of science are more familiar to me. That's where I'd want to start as well, but if there wasn't even an Einstein in this world's history, we'll have to do the translating ourselves. It's possible that over-reliance on these creatures hampered this world's scientific development, or sent it in a different direction.