Ryuki is a rock musician who has traveled to Alola from another region beyond the sea in order to spread his fame. He's also one of the Trainers who challenges the player for the title of Pokémon Champion.
In Pokémon Ultra Sun and Ultra Moon, Ryuki also sometimes appears at the Kantonian Gym in Malie City, where he can be battled, although defeating him isn't necessary in clearing the Kantonian Gym challenge. After being defeated for the first time, he gives the player a Dragon Scale. He also promises to become a Dragon-typeGym Leader once real Gyms start appearing in Alola.
"The name's Ryuki. I'm what you might call a star. I mean, with partners like my Pokémon, how could I not be a star? I came all the way across the sea here to Alola to spread my fame out here, too! The whole world will be mine soon!"
Upon being defeated
"I'm gonna belt out everything inside of me! I've gotta encourage my Pokémon to keep rocking!"
After being defeated
"Everyone's got their own problems, huh? The critics loved my songs, but nobody was buying my music for a while, man. But I'm just a rocker down to my bones. Nothing else to do but keep on rocking. I dig you, Champ. Looks like you know who you are, too, right down to your bones."
Subsequent challenges
Before battle
"My babies here are dying to play a set. I figure what better stage than the Champion's! Allow me to introduce my bandmates! Come on, babies!"
Upon being defeated
"I'm gonna belt out everything inside of me! I've gotta encourage my Pokémon to keep rocking!"
After being defeated
"But passing through the fire makes me stronger, and that's why I'm a star! I'll roll into town again sometime, Champ. I'm always looking for a good gig."
"The name's Ryuki. I'm what you might call a star. I mean, with partners like my Pokémon, how could I not be a star? I came all the way across the sea here to Alola to challenge the Pokémon Gym!"
"But this Kantonian Gym here... This isn't a real Pokémon Gym. Still, I dig it here. It's got a feel to it, man. It's got spirit."
"Hey, Trainer. I can feel your spirit, too! Want to have a battle with Ryuki?/Hey, Champ! Why not have a battle with me? Let our fiery spirits clash in a blaze of glory!"
Sure!: "Allow me to introduce my band mates! Come on, babies!"
No thanks!: "I don't blame you. I'm a rocker down to my core, after all!"
Upon being defeated
"I'm gonna belt out everything inside of me! I've gotta encourage my Pokémon to keep rocking!"
After being defeated
"All right! My babies were all fired up to play a set, but you chilled them out nicely!"
First challenge: "That's right, a Dragon Scale! I've poured my spirit into it, too!""Hey! You're curious about what kind of item the Dragon Scale is, aren't you? Well, you'll have to figure that out for yourself!"
"Once Alola gets a real Pokémon Gym, I give you my word I'll become the Dragon-typeLeader!"
If talked to again (subsequent challenges)
"The name's Ryuki. I'm what you might call a star. And now, you're a star, too! There's only one thing two stars can do—get the crowd fired up with a blazing, rocking Pokémon battle!"
"The name's Ryuki. I'm what you might call a star. I mean, with partners like my Pokémon, how could I not be a star? I came all the way across the sea here to Alola to spread my fame out here, too! The whole world will be mine soon!"
Upon being defeated
"I'm gonna belt out everything inside of me! I've gotta encourage my Pokémon to keep rocking!"
After being defeated
"Everyone's got their own problems, huh? The critics loved my songs, but nobody was buying my music for a while, man. But I'm just a rocker down to my bones. Nothing else to do but keep on rocking. I dig you, Champ. Looks like you know who you are, too, right down to your bones."
Subsequent challenges
Before battle
"My babies here are dying to play a set. I figure what better stage than the Champion's! Allow me to introduce my bandmates! Come on, babies!"
Upon being defeated
"I'm gonna belt out everything inside of me! I've gotta encourage my Pokémon to keep rocking!"
After being defeated
"But passing through the fire makes me stronger, and that's why I'm a star! I'll roll into town again sometime, Champ. I'm always looking for a good gig."