[Demon Slayer Crossover] Who Says Poké Balls Can Only Catch Pokémon?

Nian Yuan was determined to become the finest Pokemon Coordinator. One day, while traveling to the Sinnoh Region for a Pokémon Contest, he encountered a Legendary Pokémon: Mewtwo. Before Nian Yuan could take a photo, pose for a selfie, or post about it on social media, Mewtwo blasted him away with an Aura Sphere. When he woke up, he found himself hanging from a rooftop. Where was he? In this era known as the Taisho period, Nian Yuan unlocked a new use for Poke Balls. With the stance of a baseball player, Nian Yuan hurled the Poke Ball in his hand: Leavanny, go! Oh no, he threw the wrong one! That Poke Ball was empty... It struck a spider demon, no, a spider demon from the Demon Slayer Corps' world, and sucked it inside. After shaking violently, the ball fell still. Nian Yuan: ...What kind of weird creature did I just catch? As he fought more and more demons, Nian Yuan drifted further and further from becoming a Coordinator. He wanted to be a Coordinator, not a Trainer! Battles weren't stylish at all! Later, Nian Yuan was invited to take part in the Holy Grail War. When he threw a Poke Ball at a blond man, the man caught it in one hand. Gilgamesh fixed Nian Yuan with a terrifying stare. "You want to catch me?" Nian Yuan pointed at the Lancer beside him. "No, I want him! You were in the way." Nian Yuan readied himself again and threw a ball at Iskandar. Someone snatched the ball out of the air and crushed it in their fist. Countless Noble Phantasms aimed at Nian Yuan. Gilgamesh smiled chillingly. "Can't make up your mind?" Nian Yuan: Can I still make it back in time for the Pokémon Contest? Anime featured: Pokemon, Demon Slayer, and the Gilgamesh series Theme: A spirit of adventure and exploration