https://www.gamespot.com/articles/pokemon-lets-go-pikachu-and-eevee-dont-appear-to-h/1100-6461840/

Nintendo Switch's first Pokemon RPGs, Let's Go, Pikachu and Let's Go, Eevee, arrive this November, and while they retain many of the core elements found in every mainline Pokemon game, they also mark a more simplified take on the series. We already know the games eschew wild Pokemon battles for a catching system inspired by Pokemon Go, but it appears that isn't the only feature they're missing.

Pokemon fansite Serebii recently shared hands-on impressions of the upcoming titles. Among other tidbits the outlet gleaned from the demo, it appears held items and Pokemon abilities--two staple elements of mainline Pokemon games--are nowhere to be found in the Let's Go, Pikachu or Eevee.