https://youtu.be/wIMALwkRay4 (https://youtu.be/wIMALwkRay4)
This was always one of my favorite songs from the game. I'm not sure what the key is, but it's in 3/4 and 90bpm.
Here you go!
Dropbox link with pdf: https://www.dropbox.com/s/sqjorpzb3yqdcph/Map%20%28Night%29%20-%20Tomodachi%20Life%20-%20Full%20Score.pdf?dl=0
plus video link to hear it