[Kaori]

Originally Posted by Hiroshi Sotomura

The Pokémon Company most likely funded the trailer, as it's their role to do the marketing for the Pokémon series. GameFreak likely provided some ideas, but aren't actually responsible for the trailer itself. It wouldn't be the first time The Pokémon Company has contracted an anime studio (in all cases, OLM) to make a trailer - we ended up getting promotion "episodes" for Mystery Dungeon's three games, and one for Pokémon Ranger.

It's the first time they've put one out for the main Pokémon games, which would be why everyone is so hyped about this trailer in the first place!