I don't bother with nuzlocke or mono-type runs until I beat the game once and see everything it has to offer. And I usually only do it once I get the other game too, lol. Enjoying my team so far though:
Decidueye
Snorlax
Muk
Lycanroc
Crabrawler
Salazzle
My dex is at a comfortable 134 caught right now. Above all I am currently working on setting up a team for the Battle Tree. I will use a Buzzwole and/or Pheromosa, and probably something that dicks Flying types so I won't be completely shut down by a light Flying-type breeze.
Tapu koko might make a good teammate for phero/zwole with his flying resist due to elec typing, and also get that Volt+turn momentum going. Currently im working on catching some 4iv and hopefully a decent 5iv ditto. Best I have now is 31/xx/31/31/31/30, and then 31/xx/31/xx/31/31.