A:AnswerThis is almost an updated yellow version honestly and it's a pretty sweet game if you spent 100s of hours playing red and blue like me you'll love this it's the original 151 with a sprinkle of alolan variants that you trade for from traveling npcs
A:AnswerYes, but you have to play about half way through the game before being able to. After that , you can transfer Pokemon from Go into Let's Go and then into Pokemon Home aswell.
A:AnswerNo but in the future Nintendo is thinking about adding a 3DS port to the Nintendo switch dock so it can play those 3DS games so you just have to be patient and nothing wait but the 3DS does not play on the Nintendo switch as of right now
A:AnswerYes, before beginning the game you can choose a female/male character and other customization aspects like skin tone. However you cannot choose/change the genre of your companion pokemon (pikachu or eevee).