Pokemon in general is good for kids because it doesn't require things like fast reactions, timing jumps, etc. A lot of it is walking around and turn-based battles. However, the games are text heavy, so depending on reading ability, they may struggle. I suppose a lot of the text is unnecessary, like people talking.
GamesHub - Leah Williams - 4 / 5. While overtly silly and over-the-top at times, Detective Pikachu Returns effectively balances its light with its extreme darks, wielding its cuteness as a tool to tell an impactful and fairly relevant tale about corruption, felt throughout various cases. God is a Geek - Adam Cook - 7 / 10.Pokemon Arceus completely skips the whole "travel the region, see cities and people, fight gyms, etc". Its one evolving hub and numerous near-empty open world zones. Mechanics are fine, but it feels dull after a while. Although still, the story is good and surprisingly mature for a pokemon game. Pokemon S/V suffers massively from its open world.
Ultra Sun and Moon are 3DS games, not Switch games. Your options for Switch are: Let’s Go Pikachu/Eevee - weird remakes of gen 1 that are closer to Pokémon go and they’re super simple and bland. Brilliant Diamond/Shining Pearl - awful remakes of gen 4 that don’t do anything new or exciting and have a terrible aesthetic. Sword/Shield - my HN9Tg.