I think they really do need better trailers outside of Japan. From the previous trailers I've seen here in the US, it just doesn't appeal to me, and I'm a big fan of Pokémon (obviously). I think should they release promotional trailers like the ones in Japan, sales internationally may just do a bit better. It may not be a huge difference, but you never know. I know that if I saw a game promotion like this for the first time, I'd be wanting to buy the game.
This trailer was really cool though! They look like clay though. :(