Hidden In The Fifth Movie, there were Cameo's of other Pokémon from the Previous 4 Movies. They werent in person they were drawings or mosaics that could only be seen by the very perceptive. Click the Little Picture to bring up a Window with the big Picture of it Zoomed in
Clickable Picture
Pkmn Picture

Well there you have it, look like the producers dont forget about the past movies

Pokémon Heroes - Latias and Latios

The Guardian Gods of the Water Capital - Latias and Latios


Pokémon Heroes: Latios & Latias

The Legend of Altomare

Camp Pikachu!