If you loved Pokémon the Movie 2000, try Pokémon the Movie: Volcanion and the Mechanical Marvel
A bridge between a film you've already seen and one most people haven't. Pokémon the Movie: Volcanion and the Mechanical Marvel has roughly 4.6× fewer votes than Pokémon the Movie 2000 — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Pokémon the Movie 2000

Pokémon the Movie: Volcanion and the Mechanical Marvel
What they share
Both films are directed by Kunihiko Yuyama, and they both carry the cozy mood tag, and they sit in Adventure / Animation / Family / Fantasy / Science Fiction territory. If that's the register that drew you to Pokémon the Movie 2000, the second film will land in a comparable space — through a different lens.
What Pokémon the Movie: Volcanion and the Mechanical Marvel is
Here's a movie that wants to sell you a lot of toys. Our hero is stuck with Volcanion, a Pokémon on a rescue mission to save a man-made Pokémon from a corrupt official in a mechanical kingdom. It is, at least, colorful.