Ralph

Ralph is a character of the day from Ep 102 He had an ongoing rivalry with Emily, who always tied with him in all the competitions they competed in. In one of their latest competitions, Ralph's Nidoran♂ nicknamed John fell in love with Emily's Nidoran♀, Mary. However, because Ralph and Emily couldn't stand each other, John wasn't able to see Mary.

(Source: Bulbapedia)