Welcome to the website! I'm going to move this to the FAQ thread, since it fits better there.
Actually, this mini-movie you're talking about is really just the opening of the 13th movie. It was cut when said movie aired on TV for whatever reason.
I don't quite know what you mean by "watch all the mini-movies". If you're referring to the openings of each Pokemon movie, then you should just try searching online a bit.