https://www.gamespot.com/articles/pokemon-lets-go-video-confirms-venusaur-is-pretty-/1100-6460931/

The Pokemon Company has shared some more footage of Pokemon: Let's Go, Pikachu and Let's Go, Eevee, the upcoming Pokemon RPGs for Nintendo Switch. Five brief clips of the games have been posted on the official Japanese Pokemon YouTube channel (as pointed out by Pokemon fansite Serebii), and they give fans a look at some more Pokemon running around on the overworld.

Just as in Pokemon HeartGold and SoulSilver for the DS, players can have any Pokemon follow along outside of their Poke Ball while they explore in the Let's Go titles. As previous trailers for the games have showcased, each Pokemon has its own distinctive way of maneuvering about; small Pokemon like Nidoran trot behind the trainer, while larger monsters like Charizard and Onix can ferry players on their backs.