What if they didnt make a pokemon movie since Koko because they dont have a new mythical pokemon yet? Since movie 6, every pokemon movie has at least one mythical pokemon. Generally , this mythical pokemon makes its debut in the movie. If they dont have any new mythical pokemon to debut , they slam mew or celebi to fill the mythical hole. Gen 8 only had zarude as a mythical, celebi was in his movie, and mew alread played a role in journeys, so, they had to pause the movies.