The official Pokémon movie website has updated. Translations follow:

The Pokémon Kids 2019

The Pokémon Kids 2019 were selected from nearly 1000 applicants from the general public.
Standing in their midst is the youngest of them all, first grader Hanna-chan (age 6).
She became a Cinderella, getting to sing the initial lines "Aruki-tsuzukete doko made yuku no? Kaze ni tazunerarete tachidomaru" solo after the audition judges, which included Seiji Kameda, fell completely in love with her singing voice.
From here on, the Pokémon Kids 2019 will be involved with the movie and its music, and will also be singing "Kaze to issho ni" on TV shows and at various events.

The Pokémon Kids 2019
	Hanna (Age 6, first grader)
	Momoka (Age 10, fifth grader)
	Yuri (Age 9, third grader)
	Minato (Age 8, second grader)
	Sara (Age 9, third grader)
	Akari (Age 10, fifth grader)
	Haruko (Age 9, fourth grader)

Sources: https://www.pokemon-movie.jp/song/