>>35997266>Chestnaught could beat Incineroar on a one on oneWhat does that have to do with viability? That's not how it works. For example: Decidueye gets destroyed by Incineroar 1v1, yet, Decid is RU and B- in UU viability. Now, head over to the official format, where Chesnaught and Decidueye are no where to be seen, yet Incineroar is literally number one. Above the likes of Landorus (OU) and Mega Gengar/Metagross. (Uber)
It all depends more on the environment, and how that Pokémon can thrive in it. Also I don't think Chesnaught is why Incineroar isn't RU.