After Time Travel, Monster Trainer?

Shangguan Xiangyang traveled to a parallel world, a world filled with monsters from the Ultra Universe. But what is different from what he imagined is that this world has invented props similar to Pokmon Balls that can conquer monsters! And he activated the Super Monster Trainer System and became the strongest monster trainer in the world. "The test for freshmen is to deal with Sadra? That's okay." Shangguan Xiangyang casually summoned Ultimate Tyrant. Sadra: ... Huh? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.