Where is Pokémon: The First Movie set?
1998 anime film directed by Kunihiko Yuyama
Pokémon: The First Movie (1998) is not pinned on this map. Wikidata records no setting for this anime. What is below is the weaker claim its Japanese Wikipedia article makes: the real places its setting was modelled on. Where the anime takes place, not where it was made: an anime is drawn and filmed nowhere, so this is the only kind of location it has.
Part of the Pokémon film series
Drawn from these real places
Japanese Wikipedia says this anime’s setting was modelled on these real places. Nothing was filmed at them.