It was announced that the upcoming anime movie Pokemon the Movie: Koko will be released on December 25, 2020. It was also announced that Taiiku Okazaki will produce the songs in the movie while Tortoise Matsumoto will be performing the main theme of the movie titled “Fushigi na Fushigi na Ikimono (Mysterious Mysterious Creature)”. They also released the latest promotional video for the upcoming film.
Source: Pokemon Official Japanese Website