Reiji is a self-proclaimed Psychic.

He entered the Bell of Wishes Festival contest along with Ash, Iris, Cilan, and Stephan and was grouped with them in the first portion of the contest. Instead of playing fairly, he used his Elgyem to use its Psychic-type powers to get through most of the competitions. Though, it was his cheating that helped the gang get through the quiz portion of the contest by using Elgyem to manipulate Mile's mind to get the right answer.

(source: Bulbapedia)