Lugia is a Pokeball Pokemon and, as Shadow Lugia, a boss for Smash Bros. Clash. As a boss, his battle theme is the Weather Trio's theme from Pokemon Ruby, Sapphire, and Emerald. As a Pokeball/Assist, he roars loudly and unleashes the attack Dragon Pulse much like he did in Melee and Brawl. When Lugia makes a roaring sound, it sounds like a mix of Nefarian's roar and a T-Rex's. Like the Shadow Hunter enemy, Shadow Lugia was spawned through corruption, thanks to the monsters of the night covering the dragon's entire body, transforming him into Shadow Lugia.
Shadow Lugia

Shadow Lugia, his boss counterpart.