I was still using a Blaine deck, but I was making no progress in ranked. It's good enough to hover about in UB1, but not good enough to get to UB2. So I switched to a Rampardos/Lucario deck and got to UB2 without too much difficulty even though I only have one rare candy. Haven't tried to progress to UB3 yet.
I pulled a second Solgaleo, but haven't really tried it out yet. The problem with stage 2 decks (or even stage 1 decks) is that they always have a chance to brick, whereas Darktina is so consistent because it's only basics. I'd like to try a Darktina counter deck, but I don't have any Oricorios.