A Rathalos appears in ''[[Super Smash Bros. Ultimate]]'', both as an [[Assist Trophy]] and as a boss in both Classic Mode and the World of Light, the first to appear as both. HeIt is one of the few third-party Assist Trophies without any playable fighters from their home series, with the others being [[Assist Trophy#Akira|Akira]], [[Bomberman]], and [[Assist Trophy#Shovel Knight|Shovel Knight]].
As an Assist Trophy, heit can strike the opponent with hisits claws or breathe fire onto the stage. When heit roars, nearby fighters may be stunned. In the boss fight for Rathalos, the player fights himit on a flat plains stage resembling the [https://monsterhunter.fandom.com/wiki/Ancestral_Steppe Ancestral Steppe] from the ''Monster Hunter'' series. HeIt is fought in the final round in the Classic Mode routes for [[Yoshi]], [[Marth]], [[Duck Hunt]], and [[Piranha Plant]]. HeIt is also fought in the Classic Mode route for [[Bowser]] and [[Hero]], albeit before the final round (with [[Mario]] and [[Metal Mario]] for the final battle for Bowser, and with [[Robin]] and a giant [[Charizard]] for the final battle for Hero).