One-Scene Wonder: The man and his daughter, who were briefly seen with Aipom in the beginning of Pokémon Heroes, are given a similar appearance alongside Chimecho and Chingling.
The man from Jirachi: Wish Maker, where he sold May her Wishing Star, sold Dawn a Lunar Wing.
Finally, the mother and girl that were reading the legend of Rota in the beginning of Lucario and the Mystery of Mew were seen buying cotton candy and running away from Darkrai. These two are seen again in the next movie.
Every legendary that appeared in the Pokemon movies before show up during the intro, including the non-legendary Lucario.