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Gonna give an actual answer and controversial as it is, I'm gonna stick to it.
Decidueye.
As controversial as Incineroar and Primarina are, they're memorable and they have actual fanbases. I never really see active talk or enjoyment of Decidueye outside of the shitty falseflaggers, and a lot of people chose it purely under the guise of "the normie choice", with the de-facto implication it's going to be forgotten come Gen 8. Throw in its prominence is in Pokken, which has gotten barely any fan hype despite Nintendo's pushing of it, and Rowlet being the evolution of choice in its line, and I don't really know or can think of anyone using it as their ace, bro, etc.
If you like it, that's great. I'm not saying the above to insult you nor is it intended to. But for whom is it this is their MAIN mon? THE mon? Not just a cool team member, or even mere filler?