A special art poster inspired by the beginning of the adventure of Satoshi and Go was created. It was also announced that the opening theme for the series is called “1, 2, 3” and Soraru and Mafumafu gave some comments.

YouTube Clip - Anime Pocket Monsters 2019 Trailer

Sources: https://www.youtube.com/watch?v=2AZd74zPCMw and https://www.tv-tokyo.co.jp/anime/pocketmonster/news/index.html#217755

Trailer Translation:

Narrator: Pocket Monsters, or "Pokémon" for short:
Narrator: They're enigmatic creatures that hide many mysteries.
Go: What's THAT Pokémon?
Okido: It might have been a Mew.
Okido: It's said to be a mythical Pokémon.
Sakuragi: Go is just making his debut as a Trainer, so he hasn't been given his starter Pokémon yet.
Go: The one I choose is...
Go: Mew!
Satoshi: I've found you!
Satoshi: Let's battle!
Okido: Everyone is able to set off on an adventure alongside Pokémon once they turn ten!
Satoshi: Oh, so cute! Isn't it just the greatest?
Satoshi: I'm Satoshi from Masara Town!
Go: I'm Go from Kuchiba City!
Go: I acknowledge you.
Satoshi: As what?
Go: As my friend!
Koharu: He never seems to do anything other than Pokémon research and observation...
Satoshi: I'm definitely gonna become a Pokémon Master alongside this guy here!
Go: Just wait! I hold the future in my hand!
Sakuragi: An extremely rare Pokémon has appeared in Kuchiba's port.
Go: Just as I predicted...
Go: It's in a frenzy!