DISCLAIMER: THERE ARE SPOILERS ABOUT THE ENDING OF THE GAME INCLUDED IN THIS PAGE, READ AT OWN RISK!
Rukiryo is the creator of the game. He almost never accepts any challenges. Only one person has ever almost beat him in a battle, Supergabe8, from Team Plasma (Unova), tied in a 6 vs. 6 battle against Rukiryo's pokemon. Both players had 6 Level 90 Pokemon.
Rukiryo is the Pokemon League Champion in Pokemon Reborn RPG. He is a Dragon-type person.
Rukiryo has a Dragonite. Which is level 60.