Just recently I caught a Shiny Caterpie, Alolan Graveler, and an Alolan Raichu! I'm pretty happy with those finds all in the Sun and Moon forum.
I caught a Phanpy as I logged in to view this forum section, and then later, as I opened this thread, I encountered and captured a Teddiursa. I've seen neither before, but they were adorable enough that I didn't want to let them go.
I finally got a Larvitar! It was by far the most difficult Pokémon for me to catch so far. It took a total of 41 Pokeballs to catch... one of those being a GS ball too xD.