If you loved Pokémon Ranger and the Temple of the Sea, try Pokémon the Movie: Genesect and the Legend Awakened
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Pokémon Ranger and the Temple of the Sea

Pokémon the Movie: Genesect and the Legend Awakened
What they share
Both films are directed by Kunihiko Yuyama, and they both carry the cozy, playful mood tags, and they sit in Action / Adventure / Animation / Family territory. If that's the register that drew you to Pokémon Ranger and the Temple of the Sea, the second film will land in a comparable space — through a different lens.
What Pokémon the Movie: Genesect and the Legend Awakened is
The fifteenth Pokémon feature bravely asks: what if Pokémon, but more? Ash and company discover that a quintet of Genesect are wrecking the local power grid, drawing the attention of Mewtwo. Soon the red Genesect is battling Mewtwo, because that's how these things shake out.