Metalions Robo Battle

While cleaning his house, eight-year-old Elon finds a summoning device and scooter left behind by his brilliant scientist grandfather. While riding the scooter and wearing the summoning device on his wrist he gets into a dangerous situation. Just then, the Archean necklace his grandfather left behind starts lighting up and summons an ancient Infinite Warrior named Leo. Elon designs a stone detector and uses it to begin his journey with Leo. The pair set off in search of the stones scattered around the world.