New Gen8 Pokémon will appear in Mewtwo Strikes Back Evolution No.38378328 ViewReport
Original 1999 movie intro:
> Bulbasaur vs Donphan
> Squirtle vs Machamp
> Pikachu vs Golem, Venomoth and Pinsir
2019 movie trailer:
> Bulbasaur vs ???
In the trailer we can see a fire move (Flamethrower?) used against Bulbasaur. But Bulbasaur used to fight against Donphan (A Gen2 never seen before Pokémon in a Gen1 movie), so who's using that move? 100% sure it will be a new Gen8 Pokémon.
Unless they completely change the team for no reason.