The official Pokémon movie website has updated. Translations follow:

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It has been decided that Koichi Yamadera will play the mythical Pokémon Zeraora in "Pocket Monsters the Movie: Everyone's Story", which premieres Friday July 13th!
This is the first time in Pokémon movie history that a guest voice actor plays multiple distinct characters using entirely different types of voices!
Yama-chan, the man with the many voices, will truly bring Zeraora to life!

Website update

Characters profiles and voice actor comments
	ZERAORA A mythical Pokémon said to live in the mountain recesses of Fura City. By emitting an electric current from the pads on its arms and legs, it's able to move through the air at the speed of lightning. Species: Thunderclap Pokémon Type: Electric Height: 1.5m Weight: 44.5kg Voice: Koichi Yamadera

Source: http://twitter.com/pokemon_movie/status/1007095313142861824 and http://www.pokemon-movie.jp/chara/