https://www.polygon.com/2018/11/1/18051774/incineroar-pokemon-super-smash-bros-ultimate-characters

Incineroar, the fire-type Pokémon that debuted in Pokémon Sun and Moon, is in Super Smash Bros. Ultimate. Nintendo showed off the buff cat-wrestler during today’s Nintendo Direct, which is all about December’s Switch game.

Incineroar’s inclusion makes sense. The final evolution of the starter Pokémon Fennekin, Incineroar is a dark- and fire-type that is all about beating the crap out of other Pokémon. It’s based on a pro wrestler, as Nintendo mentioned during the presentation.