https://serebii.net/pokearth/alola/altarofthesunne.shtml and https://serebii.net/pokearth/alola/altarofthemoone.shtml
The links for the Ultra Jungle on both pages link to the Ultra Forest instead
Lapras' Go image displays the old style of Go for...
Weirdly, I was thinking about this very topic earlier today.
I think of all the types out there, the one I've definitely used the least is Ghost. It was only in Let's Go that I used Gengar, but I can't think of any other time I've used that type in my playthroughs.
Following that, my least used...