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I agree with what people are saying about Liquid Voice. It's pretty much useless in singles unless you want to bypass subs, even then Scald is a better option. It's only good on doubles because it's a Surf that doesn't hit your ally. Primarina has potential, but the lack of a better HA won't make it hit OU and it will most likely stay in UU until we get move tutors in a next installment.
Still, by a competitive standpoint, I'd say it's still the more viable starter this gen. Incineroar is also good in both doubles and singles. Decidueye will be good for trapping and BP setups for singles, but it won't fair well in doubles. Long Reach is pretty ok as an ability since you avoid abilities or items that activate upon contact that could cripple your setup.
All in all, decent starters, but not phenomenal. Better than gen 2 and 5 ones.