Pokémon news (March 19th): Mega Evolution Act IV to air this Fall, trailer
Pokémon anime: Mega Evolution Act IV
Today, the 3rd act of Pokémon: The Strongest Mega Evolution (a series of special episodes focused on Mega Evolutions) aired in Japan. At the very end, during the credits sequence, it was announced that a fourth episode, logically titled The Strongest Mega Evolution Act IV, would air this Fall. Shortly after that, The Pokémon Company uploaded a trailer for this episode, which will continue the story of the 3rd episode.
Here it is:
Source: Serebii