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I used a stable of mons from my previous adventures.
Froslass, Oricorio, Tsareena from my Moon playthrough
Corviknight, Vespiquen, Noivern, Drednaw, Salazzle from Shield
Vivillon, Delphox from X
Lucario, Samurott, Mienshao from Black 2
Sandslash, Electrode, Persian from Blue on 3ds
Chimecho from Brilliant Diamond towards the end.
Then the new ones I caught. Found a shiny Vulpix so used that a lot .