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A Rathalos (リオレウス, Liolaeus) is a type of flying wyvern from the Monster Hunter series, created by Capcom. They are one of the most well-known monsters in the series, and can appear in many varied habitats.
This giant beast will appear when summoned, spreading its wings to create a powerful attack. Rathalos has fire breath and a roar that stuns opponents. Finding a opportunity to get an attack in can be difficult!
—Super Smash Blog, Super Smash Bros. Ultimate Official Site
After he loses half his HP, the boss Rathalos will become faster. He can be stunned if hit by Pitfalls, Deku Nuts, or attacks that can cause stunning. Once his stamina is completely drained, the Rathalos collapses, just like in his dizzy animation.
Official artwork of Rathalos in Super Smash Bros. Ultimate