Thanks for the Dance
In response to this right here, I love the idea of Slash-A, even if it might be seriously underwhelming so honestly keep it as is the team looks super interestingShould I keep Sandslash-Alola for a Spikes setter or replace it with Garboder or Qwilfish? I do like Sandslash-Alola's psychic resistance, however.
Should I use Earthquake, Sucker Punch, or Knock Off for Toxicroak's last move?
As for Croak's last, I think Earthquake is most definitely the play. The ability to reliably bait in and KO Dragalge is HUGE for this team since, as I bet you've learnt, Slash-A's lackluster Spdef makes it a poor Dragalge check and that mon can consistently run through or wall a good 5/6 mons on that team, especially in conjunction with some Wish support, which most are paired with.