It's more that it didn't even get to fight after evolving, while all the other series showed us that Pokémon regain full health after evolution. Also I find Incineroar ugly and IMO, Torracat is the peak of its whole evolution line.Defeating the literal strongest non-legendary non-deity Pokémon of Alola isn’t enough for you?
It is weird you’re singling it out since literally the only Pokémon that HAD a good reason to evolve on the main cast was Torracat.